Very nice.design! I used to worry that it would be hard to dress the baby but the fact is that there is no need to. The first time I thought the size was not accurate since the 3-6M just fit my 2.5-month baby. However as there is 25% poly in the material, the rompers seems to be flexible in size. But if your baby is a big one and grows fast, I'd suggest You to buy those in larger sizes.