You should be aware of the three categories of baggage. They are Personal Item/Carry-on/Checked.

Your choice between these will depend upon how much baggage you wish to take along, the convenience of having some things with you at all times and, of course, the costs. Make as much use of the one personal item per person as possible.

Things that you may need to pack in your ‘personal item’:

iPhone, iPad or similar
Electronic games that your child likes
Headphones or AirPods for all of the above.
Non-electronic games and activities - for those periods when electronic devices are not allowed. This can be anything that you know you child will like that is sufficiently portable.
Extra sweater and/or blanket if your child is sensitive to cold. Cold pack, if sensitive to heat.
If your child is sensitive to strange smells, bring tissues or a handkerchief with acceptable perfume/odor: Strongly flavored snacks may also work for this.
Wipes, if your child likes to touch everything.
Gum, hard candy, straws and/or juice boxes, EarPlanesTM (See “During the Flight” for details).
Medications should be carried in your personal item of baggage and never in checked bags. Have an extra supply in case something is dropped or lost.
Snacks. Although snacks, including some gluten-free may be available for purchase on board, it is advisable to take along a good supply of your child’s favorite.

For information about the maximum permitted size for each category visit: [Nominated Information Resource].