It's normal shedding for them. Just let them fall off on their own, don't pull on them. You may also see small pieces of skin peeling from their heads and legs, that's normal shedding too. If you're seeing this shedding too often, you may be overfeeding and they're growing too fast. So keep track. When mine was 2 or so I only fed him around 3 times/week and he would shed every 3 or 4 months.