Why is it that human babies arent able to walk?

But other species like goats are able to walk within their first minutes of being born

20 Answers

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  • Foofa
    Lv 7
    2 months ago

    Human babies are mostly head to accommodate our bigger brains. That necessitated other body parts being smaller and less developed at birth. Goats don't have large brains so they can be born with their joints already set and their legs already strong enough to stand.

  • JimZ
    Lv 7
    3 months ago

    I'm not sure you appreciate how special our ability to walk is. We don't walk on two feet. Look down when you walk and you will see that we are essentially balancing on one foot at a time and every change in terrain requires micro adjustments far beyond what our four legged friends have to do. Human ears and balance are quite remarkable. It takes a great deal of practice to develop the needed coordination. Human babies are born with a gigantic brain that requires changes in the body. That brain continues to develop for many years after they are born but it left them in a state where they were essentially helpless for a few years requiring much parental care. The benefit was that it produced a very clever, very capable creature that evolved into the dominant large land animal on earth.

  • 3 months ago

    Since evolution works between the balance of reproduction and predation, nonhuman animals are born with the ability to walk and escape predators at the expense of a longer in-utero development that endangers the pregnant mother. Humans are primates with the ability to carry its offspring while fleeing from a predator which allowed us to give birth much sooner before the fetus develops mobility in exchange for a shorter and more safer pregnancy.

  • 3 months ago

    Gestation length in humans is believed to be shorter than most other primates of comparable size. The gestation length for humans is 266 days, or eight days short of nine months, which is counted from the first day of the woman's last menstrual period. During gestation, mothers must support the metabolic cost of tissue growth, both of the fetus and the mother, as well as the ever-increasing metabolic rate of the growing fetus. Comparative data from across mammals and primates suggest that there is a metabolic constraint on how large and energetically expensive a fetus can grow before it must leave the mother's body. It is thought that this shorter gestation period is an adaptation to ensure the survival of mother and child because it leads to altriciality. Neonatal brain and body size have increased in the hominin lineage, and human maternal investment is greater than expected for a primate of our body mass. The obstetrical dilemma hypothesis suggests that in order to successfully undergo childbirth, the infant must be born earlier and earlier, thereby making the child increasingly developmentally premature. The concept of the infant being born underdeveloped is called altriciality. Humans are born with an underdeveloped brain; only 25% of their brains fully developed at birth as opposed to non-human primates where the infant is born with 45–50% brain development. Scientists have believed that the shorter gestation period can be attributed to the narrower pelvis, as the baby must be born before its head reaches a volume that cannot be accommodated by the obstetric canal. The obstetrical dilemma posits that this is due to the biological trade-off imposed by two opposing evolutionary pressures in the development of the human pelvis. As human ancestor species (hominids) developed bipedal locomotion (the ability to walk upright), decreasing the size of the bony birth canal, they also developed ever larger skulls, which required a wider obstetrical pelvic area to accommodate this trend in hominid infants.

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  • MARK
    Lv 7
    3 months ago

    Because of parental behaviour. If a predator attacks something like a goat it is a case of look out for yourself. You have to run away. Of course parents will sometimes attack predators or attempt to lure them away from young. But for the most part its the slowest runner who gets eaten.

    In humans, like a lot of primate species, parents provide direct care to their young and protect them from predators. All primate infants need to be able to do is cling to mother.

  • 3 months ago

    The longer the time it takes to reach mental maturity, the longer it takes for the body to become adult.

  • Zirp
    Lv 7
    3 months ago

    We are born before we can walk, because if we were born later, the size of our head would kill our mother.

  • Sky
    Lv 7
    3 months ago

    Because humans are born at an earlier stage of development and evolved as a species with the mother carrying the young in her arms for transportation, protection, and nursing (hence the chest-mounted udders rather than at the lower abdomen like other species). Human ancestors lived in the trees for millions of years before the species started migrating to the ground to roam the African plains. Species like goats, horses, deer, and other ungulates are prey species and need to be able to walk and run as soon as possible after birth in order to have any chance of escaping predators. They need to be able to fend for themselves because nobody can carry them and they can't climb trees. Now, other species like mice, squirrels, raccoons, foxes, bears, etc. make nests or dens where the young will be protected, so when they're newborn they are very much helpless and can't walk or anything for quite some time because the protection of the home allows that helplessness.

    Short answer to your question: evolution.

  • oikoσ
    Lv 7
    3 months ago

    What's the rush? Some species are precocious (like goats); others are altricial (like humans). Both work, so long as the offspring grow up to have offspring of their own.

  • 3 months ago

    they dont have FOUR LEGS ..

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