There is no risk for the baby, and he may even benefit. The rare exception is the baby who has an immune deficiency. There is no such thing as nipple confusion. A baby who is only bottle fed for the first two weeks of life, for example, will usually refuse to take the breast, even if the mother has an abundant supply. A baby who has had only the breast for 3 or 4 months is unlikely to take the bottle.
Some babies prefer the right or left breast to the other.
Bottle fed babies often prefer one artificial nipple to another. So there is such a thing as preferring one nipple to another. The only question is how quickly it can occur. Given the right set of circumstances, the preference can occur after one or two bottles. The baby having difficulties latching on may never have had an artificial nipple, but the introduction of an artificial nipple rarely improves the situation, and often makes it much worse.