It takes time and patience. Try different Nipples and brands of bottles /pacifiers . My son only likes mam brand pacifiers but gulps too much air with the bottle and found that dr.brown has worked best for us. When we first started the bottle I would put a little breast milk on the nipple of the bottle so he could smell it and see that it was something familiar to him. If they don't open their mouth at first just kind of brush the nipple on their lips(same concept we use for breastfeeding a newborn) the pacifier isn't so much of a thing if they don't take it . Just keep trying without forcing it ..:)