Hi Jennifer
Try and relax. Your worries may never come true. If he sees his
parents calm then he'll feel the same.
Your little boy might absolutely adore his new sister.
He is going to learn so much from her.
A friend of mine who gave birth gave her son a baby doll too look
after, so he didn't feel left out.
He also has autism and he treated that doll like a real baby, he also
loved his little sister!!
Good luck
Dawn