The Compendium of Caraka 4.8.53

4.8.53

tatreyaṃ stanasaṃpat---nātyūrdhvau nātilambāvanatikṛśāvanatipīnau yuktapippalakau sukhaprapānau ceti (stanasaṃpat)//

Here, this is the excellence of breasts: neither too high nor too drooping, neither too thin nor too corpulent, having appropriate nipples, and easy for suckling (excellence of breasts).