Prepare toddler for baby?

Erica

Hi mamas... I know some of you have had babies since have our Aug 17 kiddos.

We're due with twin girls in about 4 months.

My son just turned 2 and has some special needs (to simplify let's call it a speech delay).

Do you have any suggestions for preparing our toddler for the babies (besides giving him a babydoll)?