<p>Since it's only been a few months, I'm curious about whether you went forward with this plan and how it is going.</p>
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<p>From what I understand, there are better ways to know which vaccine most likely causes a reaction. Different vaccines have different common reactions, and also the reactions each have a window of time in which they are known to occur after certain vaccines. If you keep a journal noting any possible reactions and how soon after the shots, you can probably pinpoint the vaccine or component that was responsible that way. If you want to know possible reactivity to future shots, it's not really a reliable method to spread them out, because some shots also have reactions associated more with the specific sequence of a series. For example, DTaP is not usually very reactive for the first 3 doses, but can cause more significant swelling for doses 4 and 5. Having spread out the earlier doses isn't going to give you much insight about whether or not these 4th/5th dose reactions are more likely to occur. MMR and Varicella are the opposite, the first dose is usually more reactive, but if your child reacts (e.g. with fever or rash, not an allergic response) then it's much less likely that the second dose will cause a reaction, should you choose to get the second dose.</p>
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<p>Also, when you get to MMR and Varicella, if you're choosing to have both of those, they have to be spaced at least 4 weeks apart if they are not given at the same time.</p>