The more babies a woman is carrying, the more likely it is that her uterus will swell, triggering contractions, says Brian Brost, M.D., associate professor of maternal/fetal medicine at the Mayo Clinic, in Rochester, Minnesota. An early due date isn't the only challenge to having multiples.
Dogs do not menstruate like humans do. Instead, they come into estrus (come into heat/season) about twice a year, once they have reached sexual maturity. This can sometimes be associated with a small amount of blood from the vulva, but it is not truly a period. Female puppies can reach sexual maturity potentially as early as six months old, although the first season (which is the closest equivalent to getting their period) is often at about nine months old.
Source: PetWave, Updated on July 16, 2015. Puppies develop from a fertilized egg to a viable fetus over a very short period of time-about nine weeks (58 â 63 days on average). This period is called âgestation.â Gestation ends when parturition (birth) occurs.Anyone breeding a litter should become familiar with the stages of fetal development so that they can take all steps necessary to attend to the needs of their pregnant dog and her future offspring.ource: PetWave, Updated on July 16, 2015. Puppies develop from a fertilized egg to a viable fetus over a very short period of time-about nine weeks (58 â 63 days on average). This period is called âgestation.â Gestation ends when parturition (birth) occurs.