Looking on the internet deeply has found these results:

adopted in the birth is the most popular phrase on the web.

adopted at birth 1179,000 results on the web	adopted in the birth 1170,000,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
His smile muscles were removed at birth. Previous names includes surname at birth. Olivia and I were switched at birth. They adopted me because my birth mother tried to abort me. We were adopted at birth. He adopted her at birth. She was adopted at birth. She was adopted and her birth mother was a drug addict.	At the same time, there are few Member States where the birth rate has grown, apart from Ireland and France which have performed well in this area as a result of specific policies that have been adopted. They adopted me because my birth mother tried to abort me. She was adopted and her birth mother was a drug addict. Similar legislation has been adopted in Quebec. A tradition since the birth of Canada. Someone should witness the birth of a god. The requisite implementing regulations are being adopted in 2004. Her depression started after the birth.

adopted at birth

1179,000 results on the web

adopted in the birth

1170,000,000 results on the web

More popular!

At the same time, there are few Member States where the birth rate has grown, apart from Ireland and France which have performed well in this area as a result of specific policies that have been adopted.
They adopted me because my birth mother tried to abort me.
She was adopted and her birth mother was a drug addict.
Similar legislation has been adopted in Quebec.
A tradition since the birth of Canada.
Someone should witness the birth of a god.
The requisite implementing regulations are being adopted in 2004.
Her depression started after the birth.