The child barely gets a mention in surrogacy agreements, other than as whose ownership it becomes.
The whole process is designed to meet the needs of the adults - the donors, the surrogates, the agencies, the prospective parents.
If the process centered the child, the adults would find egg donors who match their characteristics, not choose super models and elite athletes.
They would be allowed to know who their egg donor is - their biological mother. In most cases this info is withheld.
They would be allowed to bond with their surrogate and be slowly weaned off her, both physically and emotionally. She would be around for the first few months. But atm there are hospitals where they deliver the baby in one room and rush it through to the prospective parents in the next room, never to be seen again. In some countries and US states the prospective parents' names are on the birth certificate, so the child never gets to know who birthed them.
These children will be brought up to accept all this as normal. No one will be interested in their confusion or sadness over their loss. They will be expected to be grateful.