One of the three kittens (the white and grey male) is moving the others over and gets their nipple they were using. Yesturday, at 1 day old he weighed 4 ounces. The others were around 3.2. He is also the most vocal. I have tried matching sure the other two latch on to another nipple when he is nursing on one but then he stops and starts moving them out of the way. He also can crawl (I guess that is what you would call it) all around the nest box (about 12 inches wide and long). He seems to be over developed haha. Is it usual for a litter to have a bully kitten? I wasn't there at the birth, she may have had him first. Also, should I not worry since the others seem to be an okay weight, or should I try and get some milk replacer?