Asking for some help.. 😣

Alexis • 25, momma to a little boy, 3 years old, diagnosed with Angelman Syndrome in Nov. 2017, living life to the fullest! 💙 11th cycle TTC baby #2! 💝
My little one will be 10 months next month and he's still not sitting up unassisted, crawling, or showing any interest in grabbing toys or playing with them. His eye contact is a little off as well. He goes in for a checkup tomorrow. I feel like I've tried everything. Really starting to worry.. 😔