It's not really a matter of being "popular" or not, because you don't get to choose your birthday, and you usually only have a limited amount of say in your child's birthday.
But the trend is to have more births in the late summer and fall. likely because this falls 9 months after winter, when potential parents may be getting warmer and cozier than in the summer.
In the US in 2010 (the easiest country and year to find statistics for, in the form of them coming up at the top of the Google search results for "birth month statistics"), it appears that August had a slight edge over the other months, followed by September, July and October in that order. You'll note that these months are all in the same part of the calendar ... apparently humans are more sexually active in the winter months.
The month that has the most popular birthdays is october and August.
August
January.
Febuary?
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]
Christmas is the most popular celebration of the year
October is the month for most birthdays. July is in second place. The date which has the most birthdays is 5 October, meaning that those born that day were most probably concieved around 1 January, or New Year's Day.
February, i think.
Most love is recognized around Christmas time, so September sounds like a good bet for most common birthdays.
Historically, September has been the most common birth month globally, likely due to the conception patterns around the winter holiday season. However, there can be variations based on cultural, social, and regional factors in different populations.
What's the annual salary of the president of the United States
There is no particular month, but summer time is most popular.