My first piece of advice is to remember that all children are different. We can't ever expect one child to act, develop, anything, exactly like any other child.
You know your child better than anyone in the world, so if you think something is wrong, go with it and don't let anyone tell you differently! Dr.s have experience, but they don't know everything!
Live each day one at a time, enjoying every milestone as they come, rather than being upset that they didn't come "on time".
Listen to your kids, if they feel strongly about something, I have found that it usually is something that I need to feel the same way about. Children have awesome instincts!
Take time every day to act like your kids!
There are two things we are to give our kids, one is roots and the other is wings.