Advice is best received when it has actually been asked for rather than forced on you. Besides these are matters where only the prospective parents should make a decision. You might want to compromise/accept suggestions about less important things though.

The time of having kids should be couple's private business. They're the ones raising the kid and being stuck with it both in good bad for the rest of their life. Yeah but sometimes it's good to avoid the escalation of open conflict with parents-in-law by pretending to agree with them and then tiring them out with continious stream of escuses and meaningless chitchat. Unless the parents-in-law are stubborn as hell they sooner or later give up and you can have your way. That is if they don't manage to pull your spouse behind their opinion...

Hi, it depends on how close they are to their parents and in laws. If they live far away from each other then they can ignore the advice. I found the easiest way way to deal with my parents wanting grandchildren when we weren't ready to have them was to say, ' Yes we would like to have children but there is something wrong medically, so we're sorting this out '. Sometimes you have to tell such white lies to keep the parents in law off your back. If they live close by, it's best not to fight with them, as they will be very helpful and babysit for you when you have to go back to work. A delicate situation!

看情况，让大家都满意的很少，和谐

Well, it depends. "how much", that is hard to say. The couple should have the right to make own, final decisions, but the fact is, lots of them can not ignore parents' suggestions or arrangements. After all, parents-in-law have raised your partner for so many years. Maybe that is a little bit conservative, but sometimes you must take them in consideration.