We are both 23, I will be 24 next month. We wouldn't be trying to have a baby if we weren't financially stable.
There is no best interest to look out for though. Them being negative is also FAR from looking out for our best interest. I sometimes feel they are being negative just for the sake of being negative. There are not really any major health issues or concerns or any financial issues. It's more than one or two. It seems like none of them can say anything to me because they don't want me to know that they know we are trying. I really do'nt see what other details can be needed? If there are specifics, ask.
It's negativity in gossip. People around us have some how found out that we are trying to have a baby and have nothing but mean and negative things to say to others and the things that are being said to me are hinting that I am making a bad decision without saying it to my face. They won't come out and say "We know you are trying and we don't think it's a good idea for X reason", it's more of "I hope you two don't have kids any time soon", "You aren't planning on having kids for a few more years right", "You two know that this isn't a good time for kids because of X", "It's a good thing you've been smart enough not to get pregnant" etc. I have NOT discussed these issues with these people, and outside of them finding me discussing this kind of stuff on support forums I don't know how they found out. Unless of course someone close to me can't keep their mouth shut.
I have tried to say it politely, but it doesn't seem to get anywhere. Things like "Thanks, but we will make those decisions as a couple, without outside input". Saying something more will just create more problems it seems.