I found this article by Lauren Ahn on my Windows 8 Startup page this morning:
“Most scientists say there’s no merit to the whole horoscope thing, but new research suggests your birth month may count for something, after all. It could predict your risk of developing more than 50 different health conditions, according to a study recently published in the Journal of American Medical Informatics Association.
“Scientists at Columbia University compared the birth dates and medical records of 1.7 million patients treated at New York-Presbyterian Hospital/CUMC between 1985 and 2013. In sum they looked at 1,688 diseases.The study ruled out more than 1,600 associations between birth month and disease risk, but the data confirmed 39 suspected links between birthday and disease risk — and uncovered 16 new associations, including nine kinds of heart disease. The researchers even ruled out any factors that could skew the results.”
Read the rest here:
The Shocking Things Your Birthday Says About Your Health
int.msn.com/en-us/health/medical/the-shocking-things-your-birthday…
Sky Writer 
There are Medical astrologers. I imagine one looks at what each sign rules, specially Sun, Moon, asc. and what body part is associated and how its aspected. The ruling planet of the 6th house should impact as well.
Generalizing on the 4 seasons is iffy, it seems to me.
By: Barehand on June 15, 2015
at 4:26 am
I understand astrology and even I was shocked to see late November babies have issues with bronchitis in this data based research. I had pneumonia as a baby and have had bronchitis and walking pneumonia numerous times since, even after quitting smoking. I can be fine one day, get a taste in my mouth the next, and be coughing stuff up the following day. I’ve always said it will be the death of me; based on this research, that may not be far from the truth!
By: Karen on June 15, 2015
at 12:58 pm
They don’t mention June. Why????
By: Donna Marie 6 14 1959 on June 18, 2015
at 12:45 pm