Yep. It sure is not a case of an urgently hungry or fussy baby. The crying room would be the place to go or even a Sunday school classroom. I wish I had seen the age of the child before my first comment.
I would think a child that age is quite interactive when breastfeeding. Which makes it more difficult to have them keep quiet. People do have a right to a peaceful service when they go to church.
If the child is old enough to crawl up in the mamma’s lap and self serve the child is old enough to eat some animal crackers quietly.