I breastfed exclusively my first child until she self weaned around 1 year old.
It was very difficult from the first day to the last.
I breastfed my son until about 7 months until i lost my milk supply and he is now on only formula. After the long struggle to keep him well fed on my poor supply it was a great relief to know he had a full tummy again

It was also very difficult experience breastfeeding him as well-but not as bad as my daughter.