Yes. I bf'd my 1st for 6 months, but he had other issues, so I also had to supplement by 6 months and he liked the quickness of the bottle better.
My 2nd and 3rd I bf'd until they were 15 months. When I had testing done because we had trouble ttc the 3rd, she asked if I had trouble bf'ing because I had low levels of certain hormones. Had no troubles breast feeding the last one at all.