After spending approximately 40 weeks inside the womb, the average newborn weighs 7 1/2 pounds. Most babies weigh between 5 1/2 and 10 pounds. The average length of a newborn is 20 inches (50 centimeters), with a range of 18 to 22 inches. The average head circumference (the distance around the head) is 14 inches (35 centimeters).
Lactobacillus and Bifidobacterium are the most common probiotic bacteria. The Lactobacillus genus has 18 different bacteria strains, while the Bifidobacterium genus consists of eight strains.
Monerans can be classified into three major groups: the eubacteria (True bacteria), cyanobacteria (blue green algae) and archaebacteria (ancient bacteria). The eubacteria are the commonly encountered bacteria in soil, water and living in or on larger organisms, and include the Gram positive and Gram negative bacteria.