Isnt that just normal baby reflexes? for his first few weeks of life, when you hold your baby upright under the arms, he'll dangle his legs down and push against a hard surface with his feet, almost appearing to walk. But this is just a reflex -- his legs aren't nearly strong enough to hold him up -- and will disappear after two or three months.
Babies usually pull up on furniture and truly weight bear about 8 months but of course no two babies are the same and I guess we should just love them all for being little individuals!