LO is 11.5 months and running/walking. she's always slept in 1 piece zip up sleepers, and ever since she was around 9 months i've bought the ones with the little grippers on the feet so she didn't slip when walking around before bedtime. But I was thinking maybe it's time to switch to 2 piece pjs! Did you switch when your LO started walking? or some other time? the only thing that makes me hesitant is that we'd have to start putting her in socks. i hate socks! so...when did you switch? and any recs for 12 month PJs? are there any 2 pieces with footed no-slip bottoms or is that wishful thinking?