To the problems

With the fertilisation new life begins to grow. There's the question if the doctor is allowed to fertilise and transfer more than one egg cell at the same time to get higher chances for a nidation of one embryo. Real this isn't the problem because in a normal fertilisation often don't happen a nidation.

The ethical problem is, to produce new life (in-vitro) without thought to make him possible to become a human life. The doctor should not fertilise more egg cells than he need for transfer.

It's important too to observe in-vitro-fertilised children in their future life. Have they mental problems to accept their abnormal beginning of in-vitro-fertilisation?