Why Do Babies Tighten Their Body?

Babies sometimes stiffen their legs and arms or tighten up their body when you pick them up or they get excited or frustrated. Often this type of stiffening is no big deal. Children might also stiffen up their bottoms when they're having a bowel movement, especially if the stool is hard.

Why do babies stiffen their bodies?

Sometimes your baby might arch their back because they don't want to be held or fed. This kind of body stiffening could be a sign to put them down or change position. Some babies have strong back muscles and this may be the easiest way — other than crying — for their body to tell you what they want.

What does it mean when a baby is tight?

What is hypertonia? Hypertonia is too much muscle tone. Infants and newborns diagnosed with hypertonia have stiff muscles, especially their arms, legs and neck, which can be difficult to move. Muscle tone is the amount of resistance (tension) to movement in your muscles.