I measured the pit to pit on each, romper is 9.5, dress is 13.5 A baby size (around 12 months) might have a 9.5-inch measurement A 13.5-inch pit-to-pit measurement on a toddler dress usually points to a Size 3T or Size 4, often fitting around 3-4 years old Reasonable offers will be accepted & free gift with every order! smoke & pet free home Last pic shows a callout on inside back of romper, just the liner has the flaw there is no hole in the back of the romper only the liner