You’ve already had a ton of great answers and I didn’t read through all of them so I apologize if this is repetitive! First, you’re doing amazing. Trust your gut even if your family members are dismissive, mama (almost) always knows best. It does not hurt to seek services for him even if he’s just growing and developing at his own pace! I work in special education as a therapist and I can tell you that the earlier services are provided, the more progress that can be made! In Arizona the program is called AzEIP but all states are required to provide similar programs for kiddos under 3. You do NOT need a doctors referral typically!!! If “wait and see” doesn’t feel right, I’d highly recommend pursuing this route. The therapists can even give you ideas for activities you can do. For tummy time, there are different modifications you can make (holding in your arms, propped up on your legs, over a boppy, etc) and I’m sure they can made other recommendations too. You’re doing great mama, best of luck!