Development issues?

Rebekah
My LO had his 9 month appointment about a week ago and apparently even though he seems perfectly normal and on track to me, the doctor wants some extra monitoring done during this month. We go back at the end of April to recheck everything. 
Apparently according to this checklist they gave me, he should be able to already say 3 words (and have them mean something), be able to almost walk along furniture or his crib while standing and holding on, and other things that I thought babies did at their own pace. He JUST started pulling himself up within the last 2 days. 
It just makes me worry and feel like I'm not doing enough, even though I thought he was doing ok? Anyone else have something like this?

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