So, let's see if I understand your logic. According to your definition, all those "fetuses" that are born pre-mature and need help with breathing, etc. don't qualify as "human beings" until they're developed enough to be weaned off the technology that helped support them, right? So those (oh, I'll use my term this time) BABIES aren't human beings until the doctor signs off on letting them be released from the hospital, huh? In other words, by your definition, a baby that has been born prematurely is still a fetus and not yet a human being, correct? Birth no longer is a defining point, now it's not being technologically-dependent on life-support? The fetus has to "graduate" from it's dependence on the womb in order to qualify as a human being? I am stunned!
Not only that, what about full term infants who need initial help breathing? I suppose they too don't get "human" status until the oxygen tent comes off--even if it is just moments that they need this. I wonder if people lose their human qualities as well? I mean, do you cease to be human when you go under for a surgery and they use a respirator for breathing while you are under? Hey, heck with just breathing as a qualification--if someone is disabled in some way and can not survive without the extensive assistance of others, perhaps they are not or less human too? IMO, this is a pretty poor way with which to judge if someone is human or not.