Is it normal for an almost 3 week old to be eating 4 oz?? My boy is so hungry but I'm scared I'm over feeding him. His pediatrician said to feed him 45-60 milliliters, yeah that's not enough for him at all.
My kids were like that and my doctor always said if their hungry feed them. I just made sure to burp them after every 1/2-1 ounce.
You should look into pace feeding.