Yes, you can take your baby swimming even if they have a diaper rash. It is unlikely that the chlorine in the pool will have a significant impact on the healing process. Just make sure to properly care for the rash by using a strong diaper cream like Zincofax extra strength. If the rash persists, you can also consider using a stronger cream like Ihle's paste or hydrocortisone cream (avoiding the genital area) for a day or two. It's always a good idea to consult with a pharmacist for advice on the best treatment options.