Duudh jaada kar ke ujjar liquid khaana (lekin ii shades of piyar, cream, gulabi, nai to brown bhi rahe sake hae) jiske lactatingjaanwar ke mammary gland banae hae . Ii chhotaa jaanwar ke nutrition ke khaas source rahe hae (jisme breastfedinsaan ke nany bhi rahe hae) uulog solid food digest kare se pahile.[1] Duudh me dher nutrients rahe hae, jisme hae calcium aur protein, aur iske saathe lactose aur saturated fat;[2] enzyme lactase ke jaruri hae lactose ke breakdpwn kare ke khaatir . Immune factors aur immune-modulating components duudh me milk immunity ke contribute kare hae. Pahila duudh, jiske colostrum bola jaawe hae, me antibodies aur immune-modulating components hae jon strengthen kare hae, immune system ke bemaari ke against.
Ek agricultural product ke ruup me, duudh ke duuha jaawe hae, jaada kar ke gaiyaa, ek bailap me. Iske insaan piye hae aur ii bae the base ingredient hae dher dairy products ke. US CDC ii recommend kare hae ki larrkan jon 12 mahina se barraa hae (ii sab se kamti umar hae jab breast milk nai to formula ke de ke band karaa jaawe hae) ke har din duudh ke dui servings de ke chaahi,[3] aur dunia bhar me six billion se jaada log dudh, nai to duudh se banaa khaana ke khaawe hae.[4] Barraa jan ke duudh digest kare ke chhamtaa lactase persistence pe depend hoe hae, [jiske kaaran [Lactose intolerance|lactose intolerant]] log duudh ke digest nai kare sake hae.