I am only comfortable giving dd's vax 1 @ a time. So that being said, how far a part do I space them out? A week? A few weeks?
We are just beginning to vax at 19 mos.
i would look up the vaccine you are choosing, and go from there...some vaxes have a shedding period for up to 21 days, and within that 21 days, imo, their bodies are more susceptible to contracting illness, due to a suppressed immune system trying to fight off the vaccine.
I would look at the ingredients and try to space more time depending on some of the content - for example, maybe leave more time between vaxes with high aluminum content, or try to alternate vaxes that way - with/without aluminum. I would probably give more time after live virus or combo shots too.