Hi I certainily empathize with you. I had this same problem my daughter did not like breastmilk from the bottle, I never tried her with formula because it was to expensive and I really wanted her to get the benefits of breastmilk. When she was younger I did give her formula for a week because she was not nursing and she got sick. Sometimes kids know what's best for them. I would encourage you to continue breastfeeding your daughter for as long as you can, it is really the best thing. Here are some suggestion from my own experience with my daughter. If you want to maintain breastfeeding when you're are at home, you will need to pump when you are away from your daughter or your milk supply will fall. You'd need to pump once for every 3 hours but no later than 4 hours (depending upon how productiive/engorged your breast are) that you are away from her. That means if you work 8 hours you'd need to pump once in the morning and once in the afternoon. if you nurse her just before you go to work at 8AM, you can pump at mid morning around 11AM and then again at 3PM, then nurse her as soon as you get home at around 5-6PM(it's really a great way to help you unwind and reconnect with your baby), be sure to tell your sitter not to feed her with-in an hour of you picking her up. Since your daughter is nine monthes old continue to offer her the pumped milk in her sippy cup 2 OZ at a time, do you (so you don't waste it if she refuses it), keep offering it to her sometimes it would take up to 15 or more times before babies get used to it. Sometimes it is not the taste they don't like it is the temperature, my daughter used to be more open to the sippy cup of milk if I offered it at fridge temperature. she did not like it warmed up,nor at room temp. I can usually get her to drink at least 2 OZ of Breast milk if it was nice and cold. So try offering her the milk at different temperature and see which she likes best.(By the way be sure not to warm breast milk up on the stove or in the microwave, just place your sippy cup in a bowl of warm tap water for a few minutes if you need to warm up or defrost breast milk, or you can defrost it in cool tap water and offer it to her cold to see if she likes it cold like my daughter. Also Since your daughter can have solid foods at 9 Monthes mix 2 to 4Oz ot Breastmilk with baby cereal and have your sitter offer it to her with other fruit/vegetable purees for lunch and/or snacks. You can also mix breast milk in vegetable purees like green beans, sweet potatoes, corn etc. my daughter loved breast milk in most of her purees. My daughter took her milk mixed with solid foods (about 8 OZ everyday), if yours still refuses to drink B-Milk from the sippy cup, add it to her solid foods. Along with an assortment of purees & Cereal with breast milk, and diluted juices/water (especially during summer monthes, but no more than 4-6 OZ of juice a day) your daughter will do okay until you get back from work. Then you can nurse her as soon as you get home, and at bedtime, and if she wakes up at night. If you add that up you can successfully continue nursing your daughter up to 3 to 4 times a day, while supplementing with solids, pumped milk, and baby cereal. At this age doctors usually recommend nursing your child for about 6-8 times a day in addition to solids, so if you do 4 feedings a day (mornings and evenings) you are still pretty much meeting your babies needs. My daughter still nurses and she is 20 Monthes old and I still work. She got used to nursing in the evenings and morning only, she nursed now about 3- 4 times a day, even on weekends. I stopped pumping milk when she turned 12 monthes because at that time she was able to supplement with regular whole milk, I do still have a good milk supply but she get most of her calories from regular food. So in conclusion, try not to get your daughter on formular it is way too expensive, and it really isn't that good for her, certainly not as good as your breast milk. Get support,and be informed, there are many women out there who are successfully breastfeeding and working fulltime. Contact Le Leche League International LLLI.org for more information on how to successfully breastfeed while working outside the home.I wish you best of luck.