measure for armhole
 

My pattern for a baby sweater says to knit/ w/o shaping for armhole for 2 3/4". Where do I measure?

I dunno, what came before that? If you bound off sts, then measure from the same row they were bound off on - straight up, not along the curve.

It really really helps us help you better if you give us more information about the pattern, or a link to it, because we don't have the pattern in front of us like you do.