Mixing of formula milk

Hello po mga mommies! Is it safe na imix ang similac 2 and lactum 6-12? Bale 3 scoops similac 3 scoops lactum sa 6oz water together? We're done transitioning ng paunti unti na separate bottle kada milk. So far no negative reaction si baby, turning 1 year old na din this April 21. Thank you sa makaka sagot.