I'm struggling with whether to transition or not, partly because I have a child (under 5).
I get that some people don't appear to find this a problem. I'm also aware of the arguments that children are 'resilient' to such changes. On a practical level, however, I do have a problem with it. There's nothing in particular that backs up my fears but then I don't believe there's anything outside of anecdote demonstrating that everything will be fine. For the last couple of years I've observed my child wrestle with the breakup of his mother and I (after my transgender revelation) and it's far from fun to watch. So in my experience, such events do trouble young minds, and we don't really know in what way and to what extent into the future. I wish I didn't worry about it, but I do and doubt very much that my outlook will change (and I've tried, believe me). The way I view it is that I knew I was trans, yet had a child. That makes it my problem, my responsibility, not his. For me it's just one more thing to deal with, I guess.
I suspect that transitioning is somewhat personality dependent. I have a very reclusive, introverted not particularly confident personality (socially), which I think has in part prevented me from transitioning. As I mentioned in my introductory post, I have tried two courses of HRT each spanning a 6-month period, but I hit a wall once I start fearing I will be outed. I've often said to psychiatrists that in a social vacuum I would transition in a flash. But once external factors are brought into the mix -- parents, friends, work colleagues, children -- I could never imagine transitioning, irrespective of the fact that the thought of doing so plagues my mind constantly.
So to the OP I say good luck in your decision, I know it's a very difficult one. I think the strength to transition in this situation is something that must come from within, something that you're very comfortable with, rather than a decision that someone else is comfortable with. I hope that you're stronger and luckier than I am.