This is something nobody can answer for you. Kids are all different. Some are low maintenance, some are extremely high maintenance, and it's a roll of the dice as to what you can expect. My kid was extremely high maintenance in his first few years, and remains high maintenance for his age to this day (he's 15). So for the first 5 years or so both career and personal life were basically put on hold, and our marriage very nearly fell apart because we felt trapped. I have friends whose kids just do the right things all on their own though, so I know for a fact not all kids are high maintenance.