Having kids in your dating profile pics isn’t a good idea. It isn’t going to turn off everyone, but it could turn off the best prospects. The objective of a dating profile should be to put a focus on the person behind the dating profile, not on their kids.
It is particularly egregious if the person has multiple pics with kids in it all over their dating profile. It makes the person come off as though they are trying too hard. In hiding behind their kids, they give the impression that they don’t have much of a personality or much else to offer.