I bought these for my son when he was about 6 months old.  I am so glad that I bought him the toddler sized ones, as they fit him perfectly.  My friend's baby outgrew her infant sized ones very quickly.  These are super cute socks for wearing before shoes are needed.  I received sooo many compliments on these socks.  With shoes, the bow looks a little funny sticking out, but I just tuck that in.