Milk transition

Hello po. My Lo is turning 6months this October 22.. Similac user and planning to continue to Similac gain. Ang ung Similac 0-6 months eh parang hanggng Oct 10 na lang po ung stock ko. Pwede ko na ba ideretso sa Similac 6-12? Pahingi naman po ng idea kung pano kayo ngtransition ng milk Thank you