1. Development rules of baby\’s height and weight. Baby\’s height and weight are important indicators of growth and development, and are also one of the issues that parents are most concerned about. From birth to one year old, the baby\’s height and weight will change greatly. Your baby\’s weight may drop by 5% to 10% in the first month after birth, but will gradually increase with feeding and growth. Between the second and sixth months, babies gain an average of about 500-700 grams per month; between six months and one year old, the average gain is about 300-500 grams per month. And in terms of height