so i just got back from an ultrasound and they told me my baby was around 4 lbs. 4 oz. but they…

so i just got back from an ultrasound and they told me my baby was around 4 lbs. 4 oz. but they couldn't get exact measurements because his head was so far down that they could barely see it in the ultrasound. my husband swears he's too small but i don't really think so. opinions?