That doctor said WHAT!!!!! THAT IT COULD HAVE BEEN PREVENTED IF YOU BREASTFED MORE??? Honestly I'm so, so mad I could SCREAM. That is such a shitty thing to say. Way to lay on the guilt!!!! Three months is perfect and don't think otherwise.
I was only able to breastfeed him for six months.
Only?? Are you kidding? That's a great effort. Babies get all the good stuff in first three weeks so anything beyond that is amazing. I did 8 months and it broke my heart when he decided to stop (stubborn Taurus who made up HIS mind it was done) and the Nursing Mothers Association were terrible, basically made me feel guilty and got me to try all these torturous tricks to get him back on boob, which made the weaning experience terribly sad. Why didn't they say good job for doing 8 months? 8 months is great!! I'm always dubious bout the recommendations that come from people with vested interest to promote one thing or another. And all babies are different.
I'm sorry you had a tough time when you breastfed as it can be a lovely experience (was for me - although I got mastitis twice, which is a hell on earth men could NOT deal with themselves ahah) but please don't beat yourself up about it. Plenty of kids get less and grow up just super, healthy and adjusted. You do lots of other things to keep them healthy and will throughout their lives.
It's time society put less pressure on mother's to believe they have to do one thing or another.
You are doing just perfectly as you are, and your baby girl will be just fine.