Hi, I'm going crazy

I have a spreadsheet that counts up each time a month is added, I want to also add up when people shorten months like January to Jan, what do i have to type in? My original formula that adds January is:

COUNTIF(COSHH!B3:B200,"January")

COSHH is the label of the column. How do I add the phrase "Jan" to this? Is it something like?

COUNTIF((COSHH!B3:B200,"January") * =COUNITIF(COSHHB3:B200,"Jan"))

I've deleted my other thread. Please can someone help me? I will be made up if you can

thanks!