Just when you and your partner have established common ground on your baby's sleeping habits and how many toys is too many comes a new, potentially contentious co-parenting issue: discipline, the big D.
Remember that you and your partner bring different styles and experiences to parenting. This is a good thing, and it's important to respect and appreciate each other's views. Having strong opinions means your partner cares about how your baby is taught to behave and wants to contribute to that process. Your partner's ideas merit as much consideration as yours.
If you really disagree on a particular method or rule, it's best to talk about it out in the open rather than criticizing or undermining one another (or just silently seething). Be specific about your concerns and avoid being judgmental about your partner's ideas. Convey that you know it's important to come to an agreement: For discipline to be effective, it needs to be consistent.
It may help to do a little research together into the discipline subjects you differ on, consulting an expert, websites, or books about the pros and cons of particular approaches and techniques. You may find that there are more effective strategies that you weren't aware of.