U can use expressed breast mil. Otherwise Simlac Or Nan 1 is good brand. Also start complimentey feeds.

Better if you express out the milk and store it in a steel container in the freeze. It can be stored for 24 hours. Whenever to feed the child, thaw the milk in lukewarm water. Use it after putting a drop on adult hand and then on child's forearm and then feed the child with bowl and spoon or small 100ml glass. No bottle feeding. Also can start complementary feeding now. Introduce food in a step wise manner like paste and puree. This way you can avoid formula milk. However if you want to start it then any brand with type 2 like Similac advance 2

Breast milk is better you can store it,otherwise you Nanpro-2,aptamil -2 milk powder

Aptamil stage 2 Nan pro stage 2