growing pains
noun /ˈɡrəʊɪŋ peɪnz/
  /ˈɡrəʊɪŋ peɪnz/
[plural]- pains that some children feel in their arms and legs when they are growing
 - emotional worries felt by young people as they grow upTopics Life stagesc2                                     
 - problems that are experienced by a company, organization, etc. when it begins operating but that are not likely to last
- Every business experiences its share of growing pains.