teething problems
Problems encountered during the initial part of a process. Likened to the discomfort experienced by babies when they are getting their first teeth (i.e. when they are "teething"). Our supply line issues are just teething problems. Once we get the process streamlined, we'll be fine.
teething problems
or teething troubles
BRITISHCOMMON Teething problems or teething troubles are problems in the early stages of something. Some teething troubles aside, the new computer system works well. There are bound to be teething problems in a new marriage.