My wife ordered these when our daughter was right around 3 months of age.  There are a few things I really like about these little shoes.  First, when you un-snap them, they open completely, which makes it very easy to put them on squirmy feet.  Secondly, there are two snaps, so now that she is four months and growing they still fit her.  Third, they are good for layering, one day she needs these plus socks or another just these instead of socks.