I mean higher brain functions. Its not till about 2-3 if I recall (it might be older) that children begin to really distance themselves from mammals as far as brain function/ability and even older when compared to primates. At least according to current research.
At birth human infants are actually behind in the developmental curve compared to most other mammals. This is partially due to the necessity of birthing the child 'early' while the brain has not fully formed and reached its full size (which would make birth impossible given our physiology). Newborn infants are little more then a collection of senses, and reflexes, with almost non existent cognitive abilities.
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