Some Children are Potty Trained by eighteen
Months, others are still in nappies
at school. Some children are Dry,
at night, by eighteen months, others are still Wetting at ten. Some children are Talking by fifteen months and others, quite frankly, are not talking by three. It's called 'Unequal Development' and, in all probability, this is simply what has occurred here. If, in say another year, there is no improvement, then speak to a Health Worker or Paediatrician.