Your son is begging you for boundries. I am the mother of 2 yr. old boy/girl twins. I prayed for them for 11.5 yrs.. We had a hard time getting these children here & they are very desired. I am also 44 yrs. old! I said all that to give me a little step up when I tell you what I'm about to tell you. Also, I was brought up in a nice Christian family & I am a Christian lady.
I started "spanking" my kids when they were 3 mos. old in the diaper changer when they would try to roll over or kick or whatever.... I say that term "spanking" very loosely. When they were at such a young age & seemed to be squirming, I let them know that was NOT acceptable. These small actions as a small child have paid off immensly. I have NEVER had a problem with diapers & my kids are now 2 yrs. 8 mos. old. Matter of fact, they go get their diapers & wipes, & bring them to me & lay down on the floor waiting on me to change them.
The tight boundries I have put on my kids in other areas are also paying off. Some parents start the discipline later but the kids are too smart at a later age. They've figured out what buttons to push to make you fussy. Don't give in. You are investing in his future. This investment, like the stock market starts paying dividends real soon. You'll be thankful you did.
Good luck. J.