Thanks for A2A.LONG POST ALERT :)We took our daughter to India from USA when she was close to one year and the total travel time was 24 hrs. We carried a diaper bag, hand baggage, laptop bag, my handbag and a baby carrier. Diaper bag: We had everything that we needed to access easily. (5 diapers, wipes of all kinds, diaper cream, ready to drink milk, few ready to eat food pouches, a change of dress for my daughter, socks, baby bottle, liners, sippy cup for water)Laptop Bag: Along with laptop we had a few books for my daughter to entertain her and few ready to drink formula milks.My hand bag: apart from my personal belongings I carried mobile chargers and all our passports / tickets , pens etc..Hand baggage : Few change of clothes for my daughter (in case of any accidents), change of clothes for me and my husband. Extra diapers, more food and more milk.Baby carrier was so helpful. With all the carry on luggage we had and a sleeping baby, it made our transits much easier. It definitely was a life saver.Things you need to expectFirst of all, it is going to be a long day and a half. Prepare your mind for that. Babies will cry or be cranky or sleepy. Keep your fingers crossed for a sleeping baby. (Mine did. also other kids who traveled that day with us did) Most of the time for the ambiance in flight and the white noise kids sleep. They mostly wake up for soggy diaper, hunger or to play. Whenever my daughter was awake I took her for a walk. She seemed so happy.Flight pressure causes ear ache. They don't know what it is and will cry. Feeding her during take off and landing will help relieve them from ear ache. If she uses pacifier, give her one. My daughter used one and we clipped her paci to her dress. Dress her for easy and mess free diaper changes. I dressed my daughter with a full hand onesie,u00a0 Baby leg warmers (thigh socks that goes on individual legs) and another layer of sleeveless dress. She looked adorable :)Things you need to have handy:Lots of diapers, wipes, cream, disinfectant wipes (believe me they lick and bite everything around them) and hand and face wipes. Inside diaper bag I had a ready to use DIY diaper kit. I just used a small crib sheet pouch/ bagu00a0 and kept 2 diapers, wipes, diaper cream in that. So every time I need to change my daughter's diapers I just carried that instead of carrying each item individually or carrying the whole diaper bag in to the lavatory. This made the diaper changing experience much easier.Baby food, formula milk and snack (Do not rely on airlines food). Lots of different kinds of snack that does not get messy when you give it to your toddler's (crackers, m&m's, chips). I kept them in a snack size ziploc.For Baby Bottle we used ventaire. So we had one bottle in diaper bag another in hand baggage. I bought extra nipples and Disposable Baby Bottle Liners. Every time she wanted milk, I just changed nipple and liner and gave her. This saved so much time, mess and insanity. I did not want to wash baby bottles in public also din't want to carry a dozen.Few notes:Babies will have Jet-lag but that's something we can deal with after they arrived destination. During flight try to feed in her regular schedule also if she sleeps let her. Alsou00a0 don't insist too much on her quantity. We don't want a sick baby in flight.Remember to keep all food and drink in one place, it will be useful during security. Do not mind using electronics. Load your mobile phone / tablet with her favorite rhymes or TV show and appsDo not feel shy to ask for help.And finally do not worry about what others would think if baby cries. Most people understand that these things happen.Hope this helps. Happy travelling :)