Milestones

So at the doctor there is this checklist where you circle yes or no to these different developmental milestones. Once you have circled three nos, you stop, and then pick up where you had nos the next trip and go as far as you can again.

Yesterday my third no for Jackson was, "Is able to sit up without assistance of person, pillow, etc for 10 seconds on own." The answer yesterday afternoon was no. Tonight, the answer is yes. Jackson officially sat up on his own tonight while playing on the floor with us for an extended period of time.

This was of course after throwing up his evening formula all over himself, his mother and the couch. Is that a milestone?