I am breast and bottle feeding my 3week old. Be prepared to get lots of disapproving looks, rolling of eyes and tuts from midwives and health advisors! I started purely breastfeeding but the paediatrician at the hospital advised me to "top up" my baby with 1fl oz of formula when she came away from the breast as I was not producing enough milk, in fact my milk hadn't even come in so baby was starving and only getting small amounts of colustrum - she weighed just under 9lb and had a big appetite. Some professionals have told me the paediatrician was wrong to tell me it is ok to breast and bottle feed, and some have been ok with my decision. But ultimately it is YOUR decision, don't let people make you feel bad into breast or bottle feeding, whatever suits you and your baby is best.
I was lucky in that my little girl hasn't been confused (this is what I kept being told, that baby will be confused and find it hard to latch on correctly if I swap between breast and bottle, for me this hasn't been a problem), but she latched on properly immediately and I haven't had any problems brast feeding, only that I can't seem to keep up with her appetite but that is where having a breast pump and using formula has been a God send! My little one has been gaining weight brilliantly and the health visitors are so pleased with her, she didn't even lose any at her first weigh so please don't be pressured by people telling you you can only do one or the other, it is your choice. Best of luck xx