It is normal for your baby's weight to drop after birth as his/her body loses the excess fluid he/she took in while he/she was bathed in amniotic fluid in your womb. Around one week after birth, your baby's body weight should start to increase. Around two weeks after birth, your baby will recover to his/her birth weight.  In the first three months, if your baby is gaining more than 120g weekly, you can be sure that he/she is having enough milk. You may refer to the Health Booklet for the growth charts for weight, height and head circumference for age.

What does the percentile on the growth charts mean?

The percentile for each measurement item indicates how your child's measurement compares with others in the same age-group for that measurement item. For example, if the height percentile for your child's measurement is shown as 75% - this indicates that your child is as tall as or taller than 75% of children in the same age-group, whereas if the height percentile is shown as 10% - this indicates that your child is as tall as or taller than only 10% of children in the same age-group. The same applies for the percentiles for the weight or head circumference.

As children grow, the physical growth of height, weight and organs occur. They develop changes, progression and maturation of vision, auditory sense, motor skill development, cognition, speech, communication, emotion, social adaptation etc. When the children are growing physically, their nerves and intelligence are also developing at the same time, which reflects in behavioral and emotional aspects like cognition, speed, motor skills, and social adaptability; developmental milestones are established. When the development of a child is delaying in one or more milestones, it is called developmental delay.　

https://www.healthxchange.sg/children/baby-0-24-months/baby-development-milestones-1-6-months　

https://www.healthxchange.sg/children/baby-0-24-months/baby-development-milestones-7-12-months

If my child is not meeting the milestone, what should I do?

You should seek the advice of your healthcare professionals during the scheduled developmental assessment of your child.

Reference: BabyCentre UK; HealthHub