Tiffany,
Take it from me that not all boys are like your son. Every child has their own personality, and while boys TEND to be more active than girls, not all of them are.
I hope that preschool will help your son learn to control his wild impulses, for your sake as well as his! Some children do like to remove their clothing, but your best bet is to deal with it calmly and not make a big fuss over it. Your son may just enjoy watching the reaction that he gets, so when he stops getting attention for it, he should do it less often.
As far as the car seat issue is concerned, you need to make a big deal out of it. If he removes his straps again, you really need to pull over and give him heck over it. I have been in too many accidents where using car seats and seat belts kept my children safe, and I'm a big advocate of using them every time you get in the car. My sixth child tested me not too long ago. He took off his seat belt while we were driving through military family housing (speed limit of 15 mph), and when I yelled at him to put it back on, he said no and refused to do it. I let my car coast to about 5 mph, then I hit the brakes hard. Even at that slow speed, William was thrown out of his seat. He wasn't hurt, but he was scared, and it made him realize why I insist on seat belts.
As you can probably see from this forum, BGM is not very accurate. Just throw away the results and wait for your ultrasound. I hope you get your girl!
Hugs,
Roxanne
Mom to six boys and two girls.
Mom of nine, ages 22 to 2, six boys, three girls.