So I am planning a wedding that my parents are paying for. When creating the wedding invite list we gave my FH's family a set number of people to invite and if they wanted to invite more they could pay for those people. The only other rule we all agreed upon was no children...which would help cut down on costs. We made an exception for my FH's cousins children who are the 2 flower girls (both about 1 years old). I anticipated having them attend the reception as well. Then about a couple weeks ago my mother reached out to my future MIL asking if we needing to arrange any babysitter's for the friends or relatives. Future MIL replied no. Then last weekend, I overhear my FH inviting his friend's daughter to the wedding which is only a few months old (and his goddaughter). I say to him that we agreed on no babies at the wedding. He told me we agreed upon no kids and not babies. But I told him that babies are kids and that's what we agreed upon. Now my future MIL is upset about this because if babies are not allowed then some of her relatives might not attend. But I feel as if we were clear and have been more than accommodating. I don't want anyone to be upset but at the same time I don't know if there is anything I can do to appease everyone. I really don't think it's appropriate to bring babies that young to a wedding if we already said no children.