How do I transition my child from one type of formula to another?
user
Ah, yes, this is an important task. I have some excellent information for you about this subject. 
For most of the first six months of your child’s life, they can use either breastmilk or formula.  But at some point during the first year of your child’s life, you need to decide if they’re ready to switch to cow’s milk.
The challenge is that you’re still making most of their food from scratch, so it’s very difficult to know for sure if they’re ready to switch to cow’s milk.  Often parents will just guess when the baby is ready, and make a mistake and start giving their baby cow’s milk when it’s still too early.  And that can lead to a very unpleasant surprise: digestive upset, inflammation of the stomach, fever, diarrhea, and crying that’s out of proportion with any legitimate cause.  Luckily there are a few things you can do to avoid this problem.
assistant
Well I'm just transitioning from one formula to another.
user
Oh, so you have been taking care of your child for a while. I wonder if you also took the time to analyze some data about the two formulas, to figure out the nutritional differences.
assistant
How do I transition my child from one type of formula to another?
user
Ah, yes, this is an important task. I have some excellent information for you about this subject. 
For most of the first six months of your child’s life, they can use either breastmilk or formula.  But at some point during the first year of your child’s life, you need to decide if they’re ready to switch to cow’s milk.
The challenge is that you’re still making most of their food from scratch, so it’s very difficult to know for sure if they’re ready to switch to cow’s milk.  Often parents will just guess when the baby is ready, and make a mistake and start giving their baby cow’s milk when it’s still too early.  And that can lead to a very unpleasant surprise: digestive upset, inflammation of the stomach, fever, diarrhea, and crying that’s out of proportion with any legitimate cause.  Luckily there are a few things you can do to avoid this problem.
assistant
Well I'm just transitioning from one formula to another.
user
Oh! Then this is very easy for you!  Cow’s milk is a very appropriate first food.  And if you are doing one formula in place of another, then you are basically just switching from one protein source to another.  Both types of proteins have a different chemical composition, but are not enough different to make a difference for your child’s developing body.
assistant
How do I transition my child from one type of formula to another?