How old is your child? I had my 3-y/o son (then) screened at Medical City and he had basic assessment and a test provided to him. The screening costs P1,450 and papaschedule muna sa Center for Developmental Pediatrics department.
If your child has failed in their eval, they will recommend a devped for further assessment and evaluation (appointment can take weeks to months wait time) and will give you a referral for an audio brainstem response test to completely rule out any hearing problems.
You may also check out FB groups for support, mostly from US and UK whose mommies have kids with similar developmental issues (specifically late talkers) like Apraxia, MERLD and Hyperlexia fb groups. Unfortunately, wala pa ako nahahanap na support group like them nandito sa atin.