It is true, what you say.
That's odd, I made the same point, that a baby is biologically independent in a way a foetus is not, and all I got was trolling about a word definition? Hey ho...
But the issue that precipitated the question was when is the child in the womb officially a child.
Ordinarily I'd suggest referencing a dictionary, but you seem to have some weird antipathy using them.
Whether fed by one or many, the baby isn't independent before or after.
Only if you ignore the context here, and assume independent is an absolute, which of course would make the word meaningless as no one would be absolutely independent of anything. Are you independent? Grown your own food then, make your own clothes, generate your own power, built your own house, never received medical care or had a job etc etc etc..
The baby inside is still influenced by what the mother goes through. What she intakes, her emotions, her laughter, it all is taken in by the baby.
it's not a baby, and it is topologically connected, and shares the woman's immune system, and her metabolism, and gets its oxygen and nutrition directly from the woman's blood, a baby is independent of all that, just like other all other human beings, from babies through infants children and adults. One might even infer something has occurred, like oh I don't know, child birth, to sever that connection and cause this change.