In order to control the appropriate increase of the weight of your child buy a weighing scale to weigh your baby. You may want to play some baby songs to help keep your baby distracted when trying to get a reading of their weight. Purchasing a weight measuring equipment is definitely a thing to recognize when having an offspring in the family. Those are the reasons behind it:

Subsequently to its birth, the little baby is deprived of the necessary nutrients which were available in the time of pregnancy. This results in the 5-10% weight loss. However, with a steady and correct diet set by the doctor, the newborn easily reclaims the initial weight 10-14 days after birth. At that point, it is a good idea to estimate weight with so called baby-scales which are available on the market – for baby comfort reasons as well as carefully examine the growth in the baby’s mass.
As days pass by, with an appropriate diet a gradual increase in the baby’s weight can be observed. Parents should monitor their baby’s weight and note down the observed weight improvements for health reasons. It is believed that the baby’s weight should increase by 175-225g per week. By the end of the 6th month the child usually weights twice its initial weight after birth (which is usually 3 kg).
Without any doubt, it is a good idea to consider buying a baby-scale in order to make sure that your child gains weight safely.