It might depend on the dog. Bella was a genius regarding house training. She was trained around 12-13 weeks. It's unbelievable, really.
I've heard that other members had trouble with both girls and boys.
I had to house train a male Lhasa Apso once and it took 2 years. Painful!
Congrats on the baby girl! May I ask why you're planning to use puppy pads? It's just my opinion, but I think a 100% no potty in the house approach is best. I would walk Bella to the door and say, "Wanna go potty?" Eventually, she started walking to the door on her own.