You can go ahead with any good brand of prebiotics rich milk for the child so that immunity continues to develop.

Nothing can replace breastmilk. You can use a good formula milk.

Weaning is a great process and takes time as the child need to connect with food from flavour and taste aspect. You have to make the child understand the unique flavors available at home. Ensure you introduce all foods stage by stage and also continue doing breastfeeding. The child would do more of finger foods picking up

Formula milk with prebiotics would be good switch to aptmil formula milk

You can give cows milk curd and other products after one year ...