Assim Al Hakeem

Kindly refer to the following link(s):

https://www.assimalhakeem.net/i-want-to-know-your-opinion-on-xy-selection-used-in-invitro-fertilization-for-sex-selection-and-if-even-the-ivf-is-halal/ (website)

https://www.assimalhakeem.net/is-it-permissible-to-predetermine-the-gender-of-a-baby-during-ivf-gender-selection/ (website)

It is not permissible to do IVF treatment when you already have children 

IVF

Surrogacy or IVF  

Using another woman's egg to have a child?

And Allah Knows Best