Baby dog teeth have roots, which should be absorbed as the adult teeth come in. However, this does not always happen. If the root does not absorb, or the absorption is slowed, the puppy tooth does not allow the dog tooth to come in.
Using Harvard University data, the graph shows September 16 as the most common birthday in the U.S., while December 25 and February 29 are the least common. The heat graph, while telling you how popular your birthday is, also successfully tracks trends in the data. Evidently, a large proportion of babies are born in September, with the top ten birthdays falling within the autumn month. Possibly confirming suspicions we have long held about conception trends, September is nine months after the holiday season.
The storm being the miscarriage/still birth/infant death & the rainbow being the baby they have successfully carried to term without problems/complications. A few year's ago congress enacted Infant Death Remembrance Day(Oct 15th every year). During the debate one congressman described what a Rainbow Baby is. A Rainbow Baby is a child born after the loss of an infant or a Still Born infant. There called Rainbow's because storms are dark and depressing. Storms can cause permanent damage leave holes in ground.