Baby clothing sizes are usually based on age: preemie, 0 to 3 months (newborn), 3 to 6 months, 6 to 9 months, 9 to 12 months, 12 months, 18 months, and 24 months.

The brand carries baby sizes from preemie to 24 months, but it also offers clothing for toddlers and older children up to size 14, so you can continue to dress your kids in Carter's as they grow.

Image: Nordstrom. Available in sizes newborn through 18-24 months, this ultra-soft ribbed organic cotton bodysuit includes three sets of snaps so you can keep your baby comfy as they continue to grow.