Hi Jon
DLA comes in two parts - care and mobility. You can claim for his care needs now. Unfortunately, there are strict restrictions on claiming mobility, which will affect him later.
• Higher rate mobility component: Can be claimed from 3 years old.
• Lower rate mobility component: Can be claimed from 5 years old.
Yoju can read all the details on the government website.
www.gov.uk/disability-living-allowance-children BIS