Okay, ever since Maddie was old enough to put her hand in her mouth, she's been gagging herself. She stopped for awhile, and now she's doing it constantly. She's almost 15 months. She'll just shove her whole hand in her mouth and gag herself until she gets tears in her eyes. It didn't bother me at first but then my mom said she might be bringing up stomach acid. I know she's not doing it for attention because we've always ignored her when she did it. Is this normal?