This is why we all have responses prepared for interviews, and male DP never has.
This is why I have a professional twitter, and never talk about my children on it.
Absolute fuckers.
When I was employing I found that it didn't matter if someone had kids or was planning kids, or anything else - if they were a good employee, they were good, and having some flexibility from both sides made it work.
Besides which, pregnancy and childcare is only one reason people are out of work - I remember in one job my boss was out for 6 months following a (catastrophic) sports injury, another was regularly in hospital with crippling migraines, a 3rd had time off for a sex change, another had some major dentistry work (jaw related) that took them away for a month, and then regularly out after that. Not to mention the older employee who broke her hip and was housebound, so we brought work to her, and another poor guy who had a heart attack and was blue lit from the office, and retired rather than come back.
I don't see people keeping back that they kite-surf or play rugby, or any other high risk activities though.