The greatest defense for a child being a baby at the moment of conception:

Surprise, surprise! The bible is the greatest defense for a child being a baby in the womb.

And the woman conceived; so she sent and told David, and said, “I
am with child.” 2 Samuel 11:5
(notice that she didn't say, "I am with fetus". Absurd! She is with
"child").

"Surely I was sinful at birth, sinful from the time my mother
conceived me." Psalm 51:5
(notice the psalmist attributes person hood at the moment of
conception. The psalmist says "me").

"Scarcely had I passed by them, When I found the one I love. I held
him and would not let him go, Until I had brought him to the house
of my mother, And into the chamber of her who conceived me." Song
of Solomon 3:4
(notice Solomon's lover attributes person hood at the moment of
conception. Pay close attention to the word "me". She says that she
held him and went to the chamber of her who conceived "me". Not a
blob of tissue).

For their mother has played the harlot; She who conceived them has
behaved shamefully. For she said, ‘I will go after my lovers, Who
give me my bread and my water, My wool and my linen, My oil and my
drink.’ Hosea 2:5
(Hosea says, she who conceived "them". The children were babies
from the moment of conception).

"Now indeed, Elizabeth your relative has also conceived a son in
her old age; and this is now the sixth month for her who was called
barren." Luke 1:36
(The angel says that Elizabeth's conception is of a "son". Not some
blob of tissue that can be disregarded. But even at the moment of
conception there is person hood).

"And when eight days were completed for the circumcision of the
Child, His name was called JESUS, the name given by the angel
before He was conceived in the womb."
("He" was conceived in the womb. Not "it" or "the fetus". But
"He"!)