If we can't decide on when life begins, let her kill her child after birth, as well, if it is better for her? Why not as a toddler, if it is a burden? It's not a fully-formed human, the same argument applies.

Why not default to protecting life as a default instead of murder?

Why not spend resources to help the mother with pregnancy and taking care of the child or adoption?

If there are alternatives to killing innocent life, why not pursue them instead? 

 Why not default to protecting life instead of murder? Why not spend resources to help the mother with pregnancy and taking care of the child or adoption?

You can. You just can't force the mother to carry on something on HER BODY that she doesn't want to. But feel free to develop mechanisms that the fetus can develop outside the mother.  

 Happy with killing a child?

Happy with your wife killing your son against your will?

Happy with ripping a baby up in the womb?
https://m.youtube.com/watch?v=eR1Ut4BPbOw 

 You are missing that there are two humans involved. 

 Ah the forced birth conundrum.