Hello! Could you please tell me, I usually don't express milk, we're 4…

Hello! Could you please tell me, I usually don't express milk, we're 4 months old now, I just expressed some milk, there was a lot of milk in my breasts, and my baby has no appetite since morning, look at the photo, there is a lot of foam, I washed the bottle with boiling hot water without detergents, and just expressed it, the pressure was strong...is that foam normal? Can I give the child?