Can you have sexual stimulation in the first 4-6 weeks after giving birth?

As long as the vagina wasn't injured during (vaginal) child birth, you could have sex immediately after giving birth. Not sure the new mum would be in the mood though... Ask your doctor when it is okay if you had a caesarian birth. If by the term 'sexual stimulation' you mean masturbation, there shouldn't be any problems when you do this, even in the days after giving birth. If you have had a caesarian it might not be comfortable for a while but you won't hurt yourself.