my baby is about to be 4 months old. she gets irritated by the saliva producing in her mouth. Somtimes she wakes up in the middle because of this. I know saliva producing is good but my baby is not comfortable with it. She turns to extreme left or right to get the saliva out of her mouth onto the sheet behind. I wish her swallowing muscle was developed. Is there any solution to this or all I have to do is calm her everytime she cries because of this?