Please visit a child development clinic. Needs physio.

You can wait till 18 months. If no signs of improvement in milestones then get him checked by a Paediatrician.

Most babies take their first steps by their first birthday. By the time they're15 months old, most toddlers are walking unaided, though often with uneven steps. Try not to worry if your baby takes a little longer. Some children don't walk until they are 17 months or 18 months old . But with regular stimulation, they start walking at 18 month of age.