Telling my FIL

So my FIL is very judgemental of my husband and I wanting to start a family "young" I'm 21 and he's 25. The Friday after my husband and I find out we're pregnant my FIL calls him and starts casually talking about how stupid we would be if we had kids before we're 30, and how we would ruin our lives, and I'm too unhealthy to have a baby because apparently all I eat is Captain Crunch cereal. 1) We're married so if I want to have a baby I damn well please 2) Having a baby doesn't mean we can't travel 3) I hate captain crunch and I only eat healthy. So my question is should we tell my FIL now or wait?