



Baby clothing sizing works differently from adult sizing. Sizes are expressed as age bands, but babies within one age band vary widely, so the weight and height range printed on the label is a far better guide than the month number on the front.
Carter’s organises its range around those age bands across bodysuits, sleepwear and coordinated sets. Because babies outgrow sizes quickly, many buyers size up deliberately — which works for daytime clothing but matters less for sleepwear, where fit is tied to safety labelling rather than to preference.
What to check when comparing listings:
Buying ahead is common in this category, and it works better for some items than others. Daytime bodysuits and sets bought a size up get worn eventually; Carter’s sleepwear bought large does not, because the safety labelling assumes a fitted garment. Splitting a purchase along those lines avoids waste.
Which Carter’s sizes, prints and sets are listed changes as ranges are refreshed, so compare the current listing details.