Concentric contractions: A concentric contraction is a type of muscle contraction where the length of the muscles shorten while undergoing tension. For example, when you pick up a curl bar and perform a biceps curl, the length of your biceps muscles shorten.
Here are just a few reasons why your baby may have blood in his stool: 1  An anal fissure, which is a small anal tear often caused by passing a hard stool. 2  A food allergy. 3  Maternal blood from delivery or from cracked, sore nipples.  An intestinal 1  infection. An intestinal disorder, such as colitis or intussusception.
This tends to cause blood in the babyâs stool and the main reason is attributed to genetic trends. The immune system of a baby is not developed and this makes them susceptible to infections. It is observed that bacteria evade over the intestinal wall and degeneration of it may cause spike of blood in the stool of infants. Treatment