There's having to take time off for parental leave. There's not always being able to stay for networking after work. There's having to stay home when your kid is sick. And the list goes on and on why becoming a parent means sometimes not being able to be at work or working. However, it is still the case that for mothers this compromises their career more than for fathers, resulting in less pay and an overall perception of being less competent: an issue called the motherhood penalty, which was also highlighted when Gina Baucom asked for examples of crappy things that are being said to women academics the other day.
The other day I got a bit more insight into why this could be on a level I hadn't considered yet. Someone I know had her second kid about a 1,5 year ago and the first time year had been quite a struggle: she was tired, also moved to a different house and at the same time was making a huge effort to perform at the same level she did previously. This nearly resulted in a burn out, except that she had a very kind and caring manager who sent her home at just the right time and told her to take it easier. At this point she was crying, tired and just not the strong person she was otherwise.
After this first year, she started to feel like her normal self again: more sleep, normal hormone levels, etc. However, at the same time she noticed that her manager still treated her like the more fragile person who needed help and protection. Her manager would not give her the more challenging projects even though she was very capable of taking those on again. And ultimately her male colleague who had been there shorter got a promotion and she didn't. Seemingly because her manager could not get rid of the notion they had of her being weak. She felt that not only did she have to fight to get back into all her projects, she had to fight double hard to erase her manager's notion of her being a weak person.
I'm not sure there is an answer here in how to navigate this path, but I'd be curious to hear what you would advice here, dear readers!