Hi Carole,
Don't worry about ur bb's development..let her take her time lor. slow development doesn't mean dumb lah, dun worry...at least dat's wat i believe.
My hb oni starts talking at the age of 3...but he's in the gifted programme leh...I know how to walk when I am 10 mth old...but i quite dumb leh..hehe...
My ger flip, crawl and eat from spoon earlier than my niece who is 2 mths older than my ger, but somehow i feel that my niece looks smarter leh..so, conclusion is, pace of developement is not correlated to intelligence level...dun worry, be happy.