The average newborn weighs about 3.4kg (7lb 8oz). Babies weighing more than 4kg (8lb 13oz) at birth are considered larger than average, or macrosomic (NCCWCH 2008, RCOG 2012). If you have a very large baby, weighing 4.5kg (9lb 15oz) or more, it can put you and your baby at greater risk of certain complications.