While I think that it is every parent's choice to sit in first or coach with their infant, my husband and I choose not to. Our son is an amazing flyer at 8 months and does not fuss much at all, but we would rather sit all in a row of 3 seats so he can use his carrier and in first/business you don't have that choice. Also, logistics aside, I have seen how some "respectable business people" treat parents and children in first and I can't subject myself or my child to that. There seems to be a lot of ill will when it comes to children in any class on the plane, but in first I have seen it reach a whole new ugly level. Besides, he flew in first for 6 months incognito when I was pregnant :-).