answer solved. In cases any mum get the same issues in future. Jab side effects kicked in only 8-12 hours after and your kid will be sleeping more, fussy and down with slight fever. no worries, just make sure he or she drinks well.
Perhaps, your little one might be feeling discomfort and just need more rest from the vaccine. Just look out for any fever symptoms, for next few days if your little one is the same.