Australian children's health specialists say Prince George is an advanced baby with excellent developmental skills for a child of his age.
Sydney paediatricians who observed his responses in photographs and on television footage of his two public appearances say the nine-month-old is progressing well and his parents should be pleased their child is in the top range for his age.
'He looks like a very mobile baby who actively plays with toys and crawls around and he could be almost walking which is very good at nine months,' said Dr Antonia Milner of the Sydney Children's Hospital.
'A mobile baby who will go after the toys he wants, and perhaps pulling himself up to stand, chucking a toy to the ground is all good.
"And if he's standing alone, waving bye bye and clapping or saying more than 'Mum' and "Dad" that would be very advanced.
'He looks like he might be about to walk. It's probably a little bit early for a nine-month-old. The fact he's playing with babies or small children, that's more likely than responding to adults who aren't his parents.
'But getting excited with the little animal in the zoo, that's pretty advanced. [The Duke and Duchess] do have a pet dog I know that, so he might have experience with animals through that.
'He's obviously aware of the world and interested in the world. It's lovely to see such an aware baby.'
Paediatrician and developmental specialist Dr Lee Sutton said she was impressed with Prince George's focus on the animal named after him at Taronga Zoo, the bilby.Daily Mail