Growth A to Z: Failure to Thrive Failure to thrive refers to a child's inability to gain weight and grow as expected for kids of the same age and gender. Most diagnoses are made in the first few years of life. Body Mass Index (BMI) Doctors use body mass index (BMI) measurements to assess a child's physical growth in relation to other kids the same age. Here's how to calculate BMI and understand what the numbers mean. Delayed Puberty Puberty usually begins in girls 8-14, and in boys 9-15. If kids pass this normal age range without showing any signs of body changes, it's called delayed puberty. Your Child’s Development: 1 Year (12 Months) Doctors use milestones to tell if a toddler is developing as expected. Here are some things your little one might be doing this month. Your Child's Development: 15 Months Doctors use certain milestones to tell if a child is developing as expected. Here are some things your toddler may be doing this month. Your Child's Development: 1.5 Years (18 Months) Doctors use milestones to tell if a child is developing as expected. Here are some things your toddler may be doing this month. Your Child’s Development: 1 Month Doctors use milestones to tell if a baby is developing as expected. Here are some things your baby may be doing this month. Your Child’s Development: 2 Years (24 Months) Doctors use certain milestones to tell if a child is developing as expected. Here are some things your toddler may be doing this month. Your Child's Development: 2 Months Doctors use certain milestones to tell if a baby is developing as expected. Here's what your baby may do this month. Your Child’s Development: 2.5 Years (30 Months) Doctors use certain milestones to tell if a child is developing as expected. Here are some things your toddler may be doing this month. Your Child’s Development: 3-5 Days Doctors use certain milestones to tell if a baby is developing as expected. Here are some things your baby may be doing. Your Child’s Development: 3 Years Doctors use certain milestones to tell if a child is developing as expected. Here are some things your toddler may be doing. Your Child’s Development: 4 Months Doctors use certain milestones to tell if a baby is developing as expected. Here are some things your baby might be doing this month. Your Child's Development: 6 Months Doctors use milestones to tell if a baby is developing as expected. Here are some things your baby might be doing this month. Your Child's Development: 9 Months Doctors use certain milestones to tell if a baby is developing as expected. Here are some things your baby might be doing this month. Your Child's Development: Newborn Doctors use milestones to tell if a baby is developing as expected. Here are some things your baby may be doing this month. Your Child's Development (Birth to 3 Years) Doctors use milestones to tell if a child is developing as expected. There's a wide range of what's considered normal, so some kids gain skills earlier or later than others. Here's what to expect as your child grows. Dwarfism Dwarfism is characterized by short stature. Many of the possible complications of dwarfism are treatable, and people of short stature lead healthy, active lives. Failure to Thrive Most kids grow well but some have ”failure to thrive.” This means they don't gain weight as expected and may not grow as tall as they should. Growth and Your 1- to 2-Year-Old You're in for a year of changes! Midway through this year, most babies are walking and starting to lose that "baby" look. Your Baby's Growth: 1 Month Put away those newborn clothes. This month your baby will grow at a surprising rate! Your Baby's Growth: 4 Months Your baby is growing in many ways. Here's what to expect this month. Your Baby's Growth: 8 Months Your baby is growing by leaps and bounds, and may even be crawling or cruising. Here's what to expect this month. Growing Pains Does your child sometimes wake up crying in the middle of the night complaining of throbbing leg pain? It could be growing pains. Your Newborn's Growth A newborn's growth and development is measured from the moment of birth. Find out if your baby's size is normal, and what to expect as your baby grows. Your Baby's Growth: 10 Months Your baby continues to grow quickly. All this activity and the foods your baby eats affect growth and weight. Your Baby's Growth: 11 Months Your baby continues to grow quickly. All this activity and the foods your baby eats affect growth and weight. Your Baby's Growth: 12 Months Your baby is almost a toddler! Here's what to expect with your little one's growth and weight this month. Growth and Your 13- to 18-Year-Old Kids entering puberty will undergo many changes in their developing bodies. Find out more about what to expect. Growth and Your 2- to 3-Year-Old During the third year of life, toddlers are extremely active and mobile, and are learning in very physical ways. Your Baby's Growth: 2 Months Your baby continues to grow at a rapid pace. Here's what to expect this month. Your Baby's Growth: 3 Months This month, your baby will continue to grow quickly. Find out what to expect. Growth and Your 4- to 5-Year-Old Kids who are 4 to 5 years old continue to learn in a very physical way, but are more focused than when they were younger. Your Baby's Growth: 5 Months Babies this age are growing in many ways. Here's what to expect this month. Growth and Your 6- to 12-Year-Old As kids grow from grade-schoolers to preteens, there continues to be a wide range of "normal" as far as height, weight, and shape. Your Baby's Growth: 6 Months Babies this age are growing in many ways. Here's what to expect this month. Your Baby's Growth: 7 Months Your baby continues to grow in many ways. Here's what to expect this month. Your Baby's Growth: 9 Months Your baby is growing by leaps and bounds. Here's what to expect this month. Growth Charts Doctors use growth charts to figure out whether kids' height and weight measurements are "normal" and whether they're developing on track. Here are some facts about growth charts.