My boy starts to walk at about 10 months, a bit earlier than most boys. However, his talking ability is very slow, he speaks his first meaningful word - single word only - on his 2nd birthday.
I think not walking well in 13-month is still among the "normal" range, isn't it? Have you ask 健康院姑娘or his pediatrican?
Wow... sounds great. Where can I get more information of the playgroup? Can you or any Bellegio moms help?