Is it ok to take 18 months baby on short 3 days tour? What should I pack for him?

absolutely :) in fact, your little one will have a superb time exploring and seeing a new destination. since you are going for 3 days, i would suggest you carry a few homemade eatables for the first day that will not get spoiled, such as halwa, vegetable dalia, vegetable chila, poha, uttapam and such. you can also pack idlis and dosas made at home depending on what your baby likes. do carry some fruits that your baby can consume in the next few days. you can also carry a pack of oats that you can make in milk in your hotel room in case there is any issues with the food. also, you can carry a few small tetra packs of milk that your baby can have, though you can get that in the hotel too. i also used to carry my baby's favourite blanket and pillow, and of course a sleep toy. also, make sure to carry a medical kit with thermometer, band aid, boroline, a kids insect repellent and some basic medicines that the doc suggests.