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Week 38: Baby develops a firm grasp. Thirty-eight weeks into your pregnancy, or 36 weeks after conception, your baby is developing a firm grasp. Your baby's toenails have reached the tips of his or her toes. His or her brain might weigh about 14 ounces (400 grams). After birth, your baby's brain will continue to grow.
Puberty starts at different ages for different kids and it is a process that takes a couple years. In general, a major growth spurt occurs at the time of puberty, usually between 11 and 15 years in boys. During puberty, they will have a growth spurt and grow to their adult height. Most boys will have their last growth spurt into their late teens. A few of these boys may grow into their early 20s. Your child should reach his adult weight by this estimation: adding your and his father's heights in either inches or centimeters, then adding 5 inches and dividing by two.