am I overreacting?

Niamh
I let my SO take our little man out without me for the first time today and he brought him to his mothers, I had no problem with it.. when he came home my LO was changed I asked SO did he get sick or wet his clothes and he said no that his mother changed his clothes to take "nice" pictures because she didn't like what I dressed him in? My SO let her?! I'm really mad at him because my LO has had a hard few days has he had a procedure for tongue tie and is a little sorry for himself today and he screams like crazy when getting changed and I just thought it was stupid to put him though a change for "nice" pictures 😡😡😡