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A foldable baby crib includes a bottom frame unit, lateral frame units, and upper and lower pivot connectors. Each lateral frame unit includes a pivot connection seat, a pair of support rods, each having a top rod end pivoted to the pivot connection seat, and a pair of top rods, each having an inner

A foldable baby crib includes a bottom frame unit, lateral frame units, and upper and lower pivot connectors. Each lateral frame unit includes a pivot connection seat, a pair of support rods, each having a top rod end pivoted to the pivot connection seat, and a pair of top rods, each having an inner rod end pivoted to the pivot connection seat. The upper pivot connectors interconnect pivotally outer rod ends of the top rods of adjacent lateral frame units. The lower pivot connectors interconnect pivotally lower rod ends of the support rods of adjacent lateral frame units. The bottom frame unit is connected to the lower pivot connectors and is operable to convert the foldable baby crib from an expanded state to a folded state, where the lateral frame units are collapsed.

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What is claimed is: 1. A foldable baby crib comprising: a bottom frame unit; a plurality of lateral frame units, each including: a pivot connection seat, a pair of support rods, each of which has a top rod end pivoted to said pivot connection seat, and an opposite lower rod end, and a pair of top

What is claimed is: 1. A foldable baby crib comprising: a bottom frame unit; a plurality of lateral frame units, each including: a pivot connection seat, a pair of support rods, each of which has a top rod end pivoted to said pivot connection seat, and an opposite lower rod end, and a pair of top rods, each of which has an inner rod end pivoted to said pivot connection seat, and an opposite outer rod end; a plurality of upper pivot connectors, each of which interconnects pivotally said outer rod ends of said top rods of an adjacent pair of said lateral frame units; a plurality of lower pivot connectors, each of which interconnects pivotally said lower rod ends of said support rods of an adjacent pair of said lateral frame units, and is connected pivotally to said bottom frame unit; said bottom frame unit being operable to convert said foldable baby crib between an expanded state, where said bottom frame unit and said lateral frame units cooperate to define a crib space, and a folded state, where said bottom frame unit and said lateral frame units are collapsed; and wherein said bottom frame unit includes a hub and a plurality of connecting sections, each having an inner end connected to said hub, and an opposite outer end connected pivotally to a respective one of said lower pivot connectors. 2. The foldable baby crib as claimed in claim 1, wherein each of said lateral frame units further includes a folding member, said folding member including a coupling part pivoted to said top rods, and a pair of movable parts, each of which is connected pivotally to said coupling part and is mounted slidingly on a respective one of said support rods. 3. The foldable baby crib as claimed in claim 2, wherein said coupling part includes a pair of coupling links, each of which has first and second link ends, said second link ends of said coupling links being pivoted to each other, said first link ends of said coupling links being connected pivotally and respectively to said top rods. 4. The foldable baby crib as claimed in claim 3, wherein each of said movable parts is pivoted to a respective one of said coupling links between said first and second link ends. 5. The foldable baby crib as claimed in claim 2, wherein said coupling part includes a pair of coupling links, each of which has a first link end connected pivotally to a respective one of said top rods, and a second link end connected pivotally to a respective one of said movable parts, said coupling part further including a pair of connecting links that have first and second link ends, said second link ends of said connecting links being connected respectively to said movable parts, said first link ends of said connecting links being pivoted to each other such that said connecting links form an inverted V-shaped configuration. 6. The foldable baby crib as claimed in claim 2, wherein each of said movable parts is tubular and is sleeved on the respective one of said support rods. 7. The foldable baby crib as claimed in claim 1, wherein each of said lateral frame units further includes a folding member, said folding member including a pair of first coupling links and a pair of second coupling links, said first coupling links being pivoted respectively to said support rods and having second link ends pivoted to each other and first link ends opposite to said second link ends, said second coupling links having second link ends pivoted respectively to said first link ends of said first coupling links, and first link ends pivoted respectively to said top rods. 8. The foldable baby crib as claimed in claim 1, wherein: said support rods of each of said lateral frame units form an inverted-V shaped configuration, and said top rods of said lateral frame units cooperate to form a looped frame when said foldable baby crib is disposed in the expanded state; said top rods and said support rods of said lateral frame units being parallel to each other and being disposed close to each other when said foldable baby crib is disposed in the folded state. 9. The foldable baby crib as claimed in claim 1, wherein said pivot connection seats of an opposing pair of said lateral frame units are each formed with a pair of horizontal slots, said top rod end of each of said support rods in said opposing pair being pivoted to said pivot connection seat by a respective pivot pin extending through and movable in a respective one of said slots. 10. A baby crib convertible between an expanded state and a folded state, comprising a plurality of lateral frame units, each forming a side of said baby crib when said baby crib is in the expanded state, and each including a pivot connection seat, a pair of support rods, each of which has a top rod end pivoted to said pivot connection seat, and an opposite lower rod end, and a pair of top rods, each of which has an inner rod end pivoted to said pivot connection seat and an opposite outer rod end, wherein said support rods of each of said lateral frame units form an inverted V-shaped configuration when said baby crib is in the expanded state, wherein said lower rod ends of said support rods of each of said lateral frame units are close to each other, and said top rods of each of said lateral frame units are pivoted relative to said pivot connection seat when said baby crib is converted from the expanded state to the folded state; a plurality of lower pivot connectors, each of which interconnects pivotally said lower rod ends of said support rods of an adjacent pair of said lateral frame units; a bottom frame unit including a hub and a plurality of connecting sections, each having an inner end connected to said hub, and an opposite outer end connected pivotally to a respective one of said lower pivot connectors, and wherein said hub is lifted upward to move said lower rod ends of said support rods of said lateral frame units close to each other when converting said baby crib from the expanded state to the folded state. 11. The baby crib as claimed in claim 10, further comprising: a plurality of upper pivot connectors, each of which interconnects pivotally said outer rod ends of said top rods of an adjacent pair of said lateral frame units. 12. The baby crib as claimed in claim 10, wherein each of said lateral frame units further includes a folding member for linking said top rods to said support rods such that movement of said support rods is transmitted simultaneously to said top rods by said folding member when said baby crib is converted between the expanded state and the folded state. 13. A baby crib convertible between an expanded state and a folded state, comprising a plurality of lateral frame units, each forming a side of said baby crib when said baby crib is in the expanded state, and each including a pivot connection seat, a pair of support rods, each of which has a top rod end pivoted to said pivot connection seat, and an opposite lower rod end, and a pair of top rods, each of which has an inner rod end pivoted to said pivot connection seat and an opposite outer rod end, wherein said support rods of each of said lateral frame units form an inverted V-shaped configuration when said baby crib is in the expanded state, wherein said lower rod ends of said support rods of each of said lateral frame units are close to each other, and said top rods of each of said lateral frame units are pivoted relative to said pivot connection seat when said baby crib is converted from the expanded state to the folded state; a plurality of lower pivot connectors, each of which interconnects pivotally said lower rod ends of said support rods of an adiacent pair of said lateral frame units; a bottom frame unit including a hub and a plurality of connecting sections, each having an inner end connected to said hub, and an opposite outer end connected pivotally to a respective one of said lower pivot connectors, and wherein said baby crib is converted from the expanded state to the folded state through a single action by moving said hub upward. 14. The baby crib as claimed in claim 13, further comprising: a plurality of upper pivot connectors, each of which interconnects pivotally said outer rod ends of said top rods of an adjacent pair of said lateral frame units. 15. The baby crib as claimed in claim 13, wherein each of said lateral frame units further includes a folding member for linking said top rods to said support rods such that movement of said support rods is transmitted simultaneously to said top rods by said folding member when said baby crib is converted between the expanded state and the folded state.