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.
Lactobacillus. There are more than 80 species of the Lactobacillus genus of probiotics. One of these species, acidophilus, is the most frequently used good bacterium, according to the University of Maryland Medical Center.ood bacteria, also called probiotics, are similar to bacteria that reside naturally in your body. Probiotics may be beneficial to your health, and they are available in yogurt or in various dietary supplements, according to the National Center for Complementary and Alternative Medicine.