Their socks are very good. I wish they did the same style in Gap Kids as my ds is too big for baby gap now. M&S do a very similar triple roll baby sock which looks identical but strangely doesn't stay on quite so well.
They are very foolish not doing online for the UK. Maybe they can't see the point of setting one up purely for the UK market and they don't want you to buy from the US website because it would be so drastically cheaper that we would never buy anything from their UK shops!
Anyhow it stops me buying quite so much American, imported stuff (not through my choice though )
If there's a Gap Kids there is normally always a section which is baby gap - I've never seen one without although there is/was a tiny Baby Gap on it's own in Knightsbridge.
Grown up Gap's don't always have the Kids - Norwich, for example.