it just comes with the territory, some babies are nippier then others, you are a big predator that is going to eat them until you gain their trust and prove otherwise. Most babies will calm down after a couple weeks, you can use a something to get them out of their defensive posture when you go to take them out; the cardboard roll from the center of paper towels works well. Keep the interactions short and positive and put them back in their enclosure once they have calmed down. Try to avoid putting them back if they bite you or seem defensive, it could reinforce the wrong behavior and take longer for them to calm down if they know that they can bite you and you will leave them alone. I would switch up the days you handle them so they don't get use to a set "schedule" and get used to whenever you decide you want handle them. Once they calm down they usually stay that way even when you don't handle them on a regular basis. I hatched out a couple really pissy babies the beginning of August and they have all calmed down to the point that I can have my 6 year old take them out of their tubs without getting bit(not that it hurts at all anyway, lol).