Four ewes had 8 twin lambs and eight mothers had 8 single lambs were placed with their own lambs in a separate partitions for 2 weeks then grouped together in two pens each pen lodged 4 twin and 4 single lambs with their dam. Lambs were identified by painting marks on their backs, then  left to suckle their dams which provided with daily supply of  concentrate ration at morning and evening. Moreover, after concentrate ration, dams were regular supplied with hay, ad-libitum. The water was supplied through water troughs permanently. Behavioral observations were carried out by video camera hanged on the ceiling of the chamber from the third week till weaning period at 8th week. The obtained results indicated that twin lambs had higher frequencies of suckling, laying, standing, and spent longer time of suckling and standing while, the single born lambs had higher frequencies of feeding, drinking, walking, running, scratching, rubbing, stretching, exploratory behaviors and playing activities including butting and jumping as well as spent longer time feeding, drinking and laying. The singleton lambs gained more weight than twins during the period from the 2nd till 4th week of age, thereafter the twins gained better weight until 8^th week (weaning), although the overall body weight gain was higher in the singletons than twin lambs