We have been to both Dubai and Florida with our respective kids at 9 months. Go and enjoy while you can but just be realistic about your expectations with a lo. If they are not mobile that is great as you can do pretty much what you would do as a couple and try can be wheeled around in the pushchair. If they are mobile, you might struggle to do the city breaks and not be able to let them have the opportunity to crawl or oddly around during the day. We finally succumbed to the whole beach holiday concept when it became apparent that nobody was having fun trying to have an adult cultural holiday with children. So enjoy while you can!