Ummmm not sure .... You'd have to research it.... Winter babies are not so bad cause when you first have them all they do is sleep and you don't have to worry about heat rash on an infant .... By the time the first summer rolls around they are more fun in the sense that a 7 or 8 month old is a great age to play in the kiddie pool with, take to the beach, push in the swing, pull in a wagon ect ....