Be firm. If u dont want anymore then tell him, but do it nicely i would suguest, let him know why u dont want anymore, use financialy emotionaly and physicly as reasons. all of those are valid reasons. Find out WHY he wants another one? is it cary his last name on? or something else? 3 children are perfect. I have 2 girls myself ages 3 on the 21st of july and one will be 2 months on the 13th of july.I also have 3 step children though.. for me 2 was plenty. i had to many problems with my pregnancies, best of luck to u!!!!