In Australia and New Zealand you will be able to find all your baby and toddler essentials such as nappies, wipes, formula and food. You will also be able to find hungry milk and products suited to babies with a dairy intolerance. The brands may be different to what your child is used to so bring your formula with you if your child is fussy or if they have special requirements. Breastfeeding in public is perfectly acceptable and is legally protected and you will be able to find changing facilities in Department Stores and in restaurants geared towards families.
Generally babies and toddlers will be well catered for in the larger resorts in Fiji. If you plan on travelling off the beaten track, research your trip carefully and ensure that your accommodation will be able to provide a cot. It may be harder to find the baby and toddler essentials that you are used to on the islands so pack most of what you will need unless you are sure you will be able to find it there. Use bottled water only with a low sodium and mineral content and bring sterilizer tablets or sterilizer bags. You should also bring powdered formula for formula fed babies as it may be impossible to find formula that your child is used to there.