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.
There are trillions of bacteria that inhabit the large intestine. The bacteria that are beneficial and help support the health of the organism are referred to as probiotics. You may be familiar with some of these probiotics, such as Lactobacillus acidophilus (which is found in yogurt) and Bifidobacterium bifidum. These advantageous bacteria perform a myriad of functions, including: