This is an excellent question. There are multiple things to consider when comparing newborn animals to newborn humans. The most important thing to consider is the size of a newborn human’s head. It is HUGE compared to the rest of their body. Baby humans have gigantic brains that help their bodies grow and develop. An animal's heads is much smaller compared to the rest of its body.
Also, baby animals normally walk on all four legs! Their legs are much more developed and have far more muscles than human babies do. Human babies have the coordination to walk; they just do not have the muscles to do it! Animals also spend more time in the womb and are able to grow just a little bit longer than humans do. Human babies are technically born 5 weeks "early." (Most mammals are in the womb for 45 weeks, while humans are in the womb for 40 weeks.)
The biggest reason that baby animals can walk, however, is the fact that it is essential to their survival. Because they are born in the wild, they have to be able to run from predators, follow their mother, and very quickly learn how to feed themselves. Deer, for example, give birth to their young in tall grass because it takes a baby deer 24 to 48 hours to stand up and find their mother. That way the baby can hide from predators while gaining strength. This is still WAY faster than humans can walk! Consider yourself lucky that you didn't have to catch your own food on your 1st birthday!
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