A baby grows both in physical and psycho-social terms and the two types are often closely linked. For now, we will deal with the physical aspects of growth in height and in weight. Figure 1 demonstrates the varying speed of growth for boys and girls during their first years of life. One can see that growth, which measures more than ten centimeters a year during the first two years of life, stabilizes at a constant seven centimeters a year until, at the onset of puberty, there is another growth spurt, occurring earlier in females than in males. If instead you want to look simply at how high a child is in relation to its age, we have other charts that show the correlation between height and age.