B.C.
Don't worry! You are doing fine. They grow at their own pace. My son loved being on my lap till he was too big to sit there. He still crawled, walked, climbed, and played fine with other kids. His preschool teacher told me there are kids who will jump into any situation with both feet, and others who will wait, watch and see how everything works before they join in any activity, and both types are perfectly normal. My son is definitely a wait and see kind of kid. Every year at teacher conference time his teachers will tell me he's so quiet, but then the rest of the year they have a hard time getting him to shut up.