C.C.
Hi S.,
yes! you are definately worrying too much! Unsubsribe to that mailing list!
Let me tell you....my 9 month old never learned to roll over. He hates being on his stomach and doesn't last too long. But he loves it when I hold him up and walk with him. I don't even know if he'll learn to crawl - he might just go straight to walking.
You can put him on his stomach for a few minutes at a time every day until his muscles are strong enough. it's just like exercise - a little at a time.
I think you just have to let him take his time. Those milestones are a great guide, but every child develops differently.
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