Surrogacy involves a baby, not just the mother's body. So it is not merely a discussion of the mother's bodily autonomy. The baby is a sentient human being, who is trafficked and traded to satisfy adult desires.
Trading humans is abhorrent and should never happen. Deliberately conceiving a human baby with the sole intention of removing them at birth is barbaric.
We understand and acknowledge the need for other infant mammals to be left with their mother's for weeks after birth. We understand this benefits their growth, development, their immune system, their neurological mapping and their physiological and emotional regulation. But with human babies born into surrogacy we deliberately create a primal wound and negatively impact their physical and emotional well being. How can this ever be ok?
If a baby is not the surrogate's biologically then we know this leads to more risk of complications for surrogate and baby and it makes no difference to the primal wound for the baby who only knows that mother's heartbeat, voice and smell.