Abu Abd al-Malik says: A person was blessed with twins, is it sufficient to slaughter a camel? We say, as for sufficiency, it is acceptable, but as for what is better, the best is that.

it should be with two rams, what relates to two rams for the boy and one for the girl.

And if he wants to do it with one also for the boy,

there is no problem in that, for it is authentically reported from Abdullah ibn Umar, as narrated by Nafi' from Abdullah ibn Umar, that he slaughtered for.

for a newborn boy with one sheep.

So we say there is no problem for him, but we say he is pledged with his 'aqiqah, and the best is that it be from sheep, and if it is not from sheep, then it is sufficient if it is from camels or cattle, and Allah knows best.