"More newborns arrive during the late summer and early fall months of July, August, and September than any other time of the year. In 2006, August hosted the most U.S. baby births."
http://www.babycenter.com/0_22-surprising-facts-about-birth-in-the-united-states_1372273.bc
do you mean what actual month or month into pregnancy ?
September is the most popular month for babies to be born in the United States. This is likely because conception often occurs during the holiday season, resulting in a higher number of births in September.
The month with the highest number of high school births is typically July, as it is approximately nine months after prom season in late spring.
There tend to be more births in September and October. This may be because there is holiday season nine months before, or from the fact that the longest nights of the year happen in the Northern Hemisphere nine months before as well.[8] October 5 is considered to be the most populous birthday in the United States.[9]
March and February is the least populated month and that is true and the populated month is october and May and December :0
September
September tends to be the most popular month for births globally. This is often attributed to factors such as holidays in December and January leading to increased conception rates.
February
august
do you mean what actual month or month into pregnancy ?
a month after both hamsters' births
No, most twins are not born in November. While studies have shown that there can be seasonal variations in birth rates, the majority of twins are born throughout the year, with no specific month consistently showing a higher number of twin births. Factors such as maternal age and fertility treatments can influence twin births more than the month of delivery.
September is the most popular month for babies to be born in the United States. This is likely because conception often occurs during the holiday season, resulting in a higher number of births in September.
The month with the highest number of high school births is typically July, as it is approximately nine months after prom season in late spring.
Most quokka births in the wild occur between February and April. However, quokkas in captivity breed all year around.
In the US, August usually has the most births per year. July and September are the next most popular and in some years surpass August. Summer months have higher birth rates than winter months with February having the least number of births.
There tend to be more births in September and October. This may be because there is holiday season nine months before, or from the fact that the longest nights of the year happen in the Northern Hemisphere nine months before as well.[8] October 5 is considered to be the most populous birthday in the United States.[9]