Dear Mom,
First - congrats on your new bundle of joy! My heart breaks for you and your family. Know that you are not alone and as crazy as it may sound and sooner than you would ever expect you will have a new normal. We are a bit over two years since our son was diagnosed and I'm not going to say its easy but it's manageable and i have an appreciation for the blessings in my life that is newfound. People surprise me and I now see beauty and kindness in others that I missed before. For example, we had a complete stranger run a half marathon to raise funds for CF after hearing our story from a friend.
Back to the topic at hand...I exclusively breastfed my son for 12 months and partially until 19 months. He had dropped down to 9% or something horrible like that after birth. Once we started on the enzymes the turnaround was dramatic. One of the toughest parts of CF is how different every person is, so there isn't an easy answer. Breast milk is certainly beneficial for babies and especially CFers. That being said, I would recommend consulting with the CF specialist regularly and the dietician at your clinic. If you haven't been to the clinic call and ask for contact info. The early days are so stressful and your CF team can only help if they know you need it. Also, trust your instincts...you are the mother and still know your child best. If your gut is telling you something is off it probably is. Most importantly, be gentle with yourself and have confidance in your decisions. Breast feeding is challenging on its own, especially with other toddlers at home, I know, so remember to weigh in the affect of bf on you. A less stressed mom is a huge win. There are pros and cons but the most important thing is to get her on a stable weight gain, however that happens. Best of luck!