BoneScience Blog — Growing Years Science

Puberty has a wide normal window. Here is when it usually starts for girls and boys today, why girls hit their growth spurt first, and when to call the doctor.

Doctors don't only look at how tall a child is. They also look at how fast the child is growing. Here is what's typical, and why one reading can fool you.

The body's biggest growth hormone pulse comes soon after deep sleep starts. Here is how much sleep kids need, and what the research has not shown.

Teens need more calcium than any other age group, and most of the bone they will ever have is built by around 17. Here is what 1,300 mg looks like, and why calcium and iron should not be taken together.