Obviously having kids is hard, but I haven't experienced discrimination that I know of. Sure, my career hasn't grown as quickly, but it has continued to grow. I work at Meta, which I think has great child benefits (I think thanks to Sheryl): 4 months paid leave per child, baby cash (a cash bonus per child), a child care FSA, and another annual cash pool benefit that can be used for more child care.
I'm 2 kids in, and I do not feel discriminated against at all. Culturally, there are tons of parents here. It wasn't like this 10 years ago though, when we were all so much younger... Maybe there is more discrimination outside the large companies?