1. Wash your hands and ensure the baby is seated upright and supervised at all times.
2. Choose a ripe avocado and a ripe banana: the avocado should yield slightly to gentle pressure and the banana should be yellow with small brown spots for softness.
3. Prepare the avocado: cut it in half vertically, twist to separate, remove the pit carefully. Keep one half with the skin on to use as a handle and slice the flesh into 1–2 cm thick wedges still attached to the skin so the baby can hold the skin and gnaw the flesh; alternatively peel and cut 1–2 cm thick sticks that are long enough for the baby to grasp (about 6–8 cm).
4. Prepare the banana: peel and cut into long sticks or halves about 6–8 cm long and 1–2 cm thick so the baby can hold them easily. Do not mash or puree — leave as intact soft pieces.
5. Check each piece for loose bits that could break off and be a choking hazard; offer only pieces the baby can hold and gum to break down.
6. Place the avocado and banana pieces on a plate and allow the baby to pick them up and explore at their own pace. Do not force feeding; stay within arm’s reach and watch for choking signs.

Summary

Simple baby-led weaning breakfast of avocado and banana cut into graspable sticks or wedges — suitable as a solid first-food option for babies showing readiness (usually around 6 months, but you specified 4–10 months; begin only when the baby has good head control, can sit with support, and shows interest in food). No added ingredients or seasonings.

Storing options

Best served fresh. Prepared avocado will brown quickly; keep any unused avocado flesh in an airtight container in the fridge for up to 24 hours (keeping the pit with the flesh can slow browning slightly). Cut banana can be kept in the fridge in an airtight container for up to 24 hours but texture will soften further — for safety and quality, prepare just before serving when possible.

Allergies and precautions

Avocado and banana are low-allergy foods for many infants, but some babies may react — note that banana and avocado can cross-react with latex (latex-fruit syndrome). Always introduce one new food at a time and wait to observe for any allergic reaction. Never leave the baby unattended while eating and be ready to respond to choking; consult a healthcare professional before introducing solids if there is a family history of severe food allergies.