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atxgrackle t1_j53v60q wrote

Reply to comment by vasopressin334 in Is there any difference in efficacy when a vaccine is administered somewhere other than the upper arm (e.g. on the foot)? by MercurioLeCher

I assumed it also had to do with babies utilizing their arms more in general but largely to feed, cling, and pull themselves (army crawl). Sore arms would be stressful for baby and parent.

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