While this might seem obvious, it's important to note that the term "lamb" is used for both the young animal and the adult female sheep. To differentiate between them, we might use terms like:
* Lamb: A young sheep less than one year old.
* Ewe lamb: A young female sheep less than one year old.
* Ram lamb: A young male sheep less than one year old.
* Ewe: A mature female sheep.
* Ram: A mature male sheep.