A.T.
Hey S.,
This is actually is fairly common. My cousin used to pull the fuzz off his teddy bear and eat it. I also had a friend whos daughter pulled out her own hair and ate it. She always kept her hair really short. Maybe you could keep her hair in a pony tail or in little braids or something... I think its from something lacking in her diet. Have you called her pedi? I don't think it really has anything to do with you having another baby...b/c my friend whos daughter did it, they weren't moving and she was the "baby" of the family.
Good Luck with everything!!