Hi all, I have been feeding my 6 week old baby with Aptamil Profutura. However, it’s been increasingly hard to find in shops so am looking to change to feeding him the standard Aptamil 1. I contacted Aptamil who advised that the only difference is where the fat blend is sourced from. How do I go about changing his feed? Can I make the change immediately to all feeds, or do I need to do it gradually? Thank you!