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Most babies transition to Two-Piece Pajama Sets somewhere between 12 and 24 months, but every child is different. The bigger signals tend to be practical ones: your baby is in a size where fitted footie pajamas are harder to find, they're potty training, or they're simply starting to assert some opinions about getting dressed. Two-Piece Pajama Sets also make nighttime changes a little easier since you're only dealing with the bottom half. For a full breakdown of the signs your little one might be ready, check out this guide.

A good rule of thumb is 5 to 7 pairs, enough to get through the week with room for the inevitable spills, blowouts, and last-minute laundry delays. That said, how many you actually need depends on how often you do laundry and how hard your kid is on their pajamas. Families who wash frequently can get away with fewer pairs, while those who prefer a bigger rotation tend to keep 7 or more on hand. The good news is that our Two-Piece Pajama Sets are built to last through plenty of washes, so the ones you buy today will still be going strong well into next year.