I had my Mirena inserted just after my 6wk check, so around 8wks. It didn't have any effect on my supply.
I BF my DD for 12mths with my Mirena and I love it.
He could be going through a fussy period or Wonder Week. If you are at all concerned about your supply, have a look at the lactation biscuits you can make.
They have brewers yeast them in, which is supposed to increase milk supply.


https://www.bellybelly.com.au/forums...supply-116517/