Hello need some help please not sure if this is right area as just joined - my son (3rd child) is 8 mths next week - he is slightly behind in coordinating / mental development approx 6-8 wks - my concern is that he doesn't seem to of developed any core strength and cannot sit unaided won't put any weight on feet / legs when held up won't lay on stomach won't make any attempt to move him self anywhere - he Lays on back happily playing for ages and will reach out to grab things above him and kick his legs out seemly with strength - he's being assessed in 2 wks by HV and just been to docs and he said I should be concerned 