I personally know one, have heard/spoken with others, and my wife was a 135 pilot when we got married. The key in all cases is working with your spouse.
The woman I personally know actually got pregnant with her second child about the time she joined one of the legacy majors. It wasn't a big deal, she had her maternity leave, and then went to work. In her case, she's the primary breadwinner. I forget what her husband does, but it's a job that allows him to take care of the kids when she's gone, and I think throw some daycare in there as well. Before flying for the 121 she was flying for a 135 with one child.
When I was at WAI last month, this was a topic that was brought up during the pilot panel (hosted by 4 female pilots). Two were younger and didn't have children, but one was well into her career, and is married to another pilot. She said she made the decision to wait until she had more seniority to have a child, and then bid first officer instead of captain, since that gave her a lot more ability to bid the schedule she wanted with her seniority level. She also said that she and her husband didn't use any childcare, they just alternated their schedules so that they could share primary care duties. This one is probably most relevant to what you're thinking, but the point is they made it work. The level of family nearby that's willing to participate certainly helps, as would an Au Pair if that's something you're willing to consider.
In the case of my wife, she took about 5 years off flying starting early on when she was pregnant with our first child so she could be a stay-at-home mom for that period, and I was the sole income earner. When she returned to flying she did have to attack the recency aspect, but that worked out pretty well. Your hours never expire, so once she got a bit of recency she was well positioned to move into a different job. I had to take on a lot more of the household responsibilities when she did that and have been the primary caregiver of the kids basically the whole time that they've been in school.
All that to say, no, a woman doesn't have to quit a flying career to have children and be a mom, the real key is working with your spouse. It's really not enormously different of a situation than two working parents who have demanding office jobs, doctors, etc. There's a lot of different ways to skin that cat, and you have to figure out what works for you.