Ujauzito ni hali ya mja (yaani mtu, hususan mwanamke) kuwa mzito kutokana na mimba. Hali hiyo kwa kawaida inadumu wiki 38 (miezi tisa hivi) ambapo mimba inazidi kukua na kukomaa ndani ya tumbo la uzazi la mama yake hadi wakati wa huyo kujifungua. Ingawa katka lugha kadhaa yanatumika majina mbalimbali kwa mimba hiyohiyo kadiri muda wa kukua unavyozidi kwenda, hakuna badiliko la msingi wala hatua mpya, bali ni ustawi endelevu. Miezi mitatu ya kwanza ndiyo yenye hatari zaidi ya mimba kuharibika. Pengine mimba si moja bali mbili au zaidi kwa wakati mmoja. Hapo watazaliwa watoto pacha. Nutrition For The First Trimester Of Pregnancy. IDEA Health & Fitness Association. Iliwekwa mnamo 9 December 2013. Bothwell, TH (July 2000). "Iron requirements in pregnancy and strategies to meet them". The American journal of clinical nutrition 72 (1 Suppl): 257S–264S. PMID 10871591 . O'Brien, KO (February 2006). "Bone calcium turnover during pregnancy and lactation in women with low calcium diets is associated with calcium intake and circulating insulin-like growth factor 1 concentrations1". Am J Clin Nutr 83 (2): 317–323.