Your baby now measures at about 4½ inches long (11-12cm) and weighs about 3½ oz (100g) now. Baby is now the size of your hand spread open wide. Fat or adipose tissue begins to form beginning from this week and continues for some weeks to come; fat is important to the heat production and metabolism. Water makes up about 3 oz (89g) of your baby's body. If it is a girl baby, her fallopian tubes are formed around this time. If you have not felt your baby move, you will soon. These movements may not be felt everyday but as pregnancy progresses these movements grow stronger and more frequent.