Mother in Law - First time "solid food"

Hey guys,I really need some support.Today my already dominant mother in law (with the presence of my girlfriend) gave my child the first "solid food". In that with solid food i mean yoghurt, but it was the first time he got spoon fed.I was at work and me and my girlfriend talked about this alot when we first should do this because in her culture babies get it after 1 month. In my culture we wait 4 months for the first time spoon fed.I dont have any problem when my girlfriend wants this badly that we do it, i do have a problem that this first moment is without me. As a former militairy guy, i choose civilian life to be with my family and dont miss out of these "special moments".Am i overreacting? I got a video at the midst of the feeding, but i just feel sad that i was not there with him.I want to make it clear to my girlfriend that these are very important moments for me, and that i dont understand what she not said anything to her mom to leave the moment for me and my girlfriend.​Aaii, alot of emotions currently, what should i do?EDIT: Ok we discussed it, i followed your guys advice. I waited a bit so i could talk without too much emotions. I explained that these milestones are important for me, and when i can i want to be present. She first felt a bit shit about today, and said sorry. After she said she understood and that in the future we do these things together. I said also that i know she thinks about me, because she sent the video but being there and looking in his eyes is different. Thanks guys, really appreciate it. via /r/Parenting https://ift.tt/2l9sUSO