Hey there! First of all, I'd like to welcome you to this community in which I joined a few days ago, and I must tell you it's a great place to be!
About your baby, speaking from my personal experience, my little princess had her first rabies shot when she was 6 months and everything went nice and smooth, no reactions, no nothing, also, our doctor didn't even mention about any possible bad reactions, I mean, after all, It's for their own sake....Not sure what to say honestly, but if you are nervous about doing it now, you can also wait until 6 months or beyond, because, at 4 months she is still quite small.
Hope this help.
All our best wishes,
Damandoree&Mab.
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