The Messenger of Allah (ﷺ) as saying: Sacrifice only a full-grown animal unless it is difficult for you, in which case sacrifice a lamb.
Sunan Abi Dawud Book 16, Hadith 10
← Previous Hadith The Messenger of Allah (ﷺ) used to sacrifice a choice, horned ram with black round the eyes, the mouth and the feet.

Sunan Abi Dawud Book 16, Hadith 9 Next Hadith → The Messenger of Allah (ﷺ) distributed sacrificial animals among his Companions. He gave me a kid (of less than a year). I took it to him and said: This is a kid. He said: Sacrifice it. so I sacrificed it.

Sunan Abi Dawud Book 16, Hadith 11