Shaking head of baby

Hello po pls enlighten me I have 5th months old at napansin ko na parang pg mtutulog sia my times na shinishake nia head nia from side to side..Wla nmn pgkakaiba s knya msigla nmn sia nung una tuwa tuwa ako kse prng pag gngwa nia un prng it's a sign of no no gnun pero may nabasa ko na baka my prblem s ears nia kaya gnun check ko naman parang Wla naman 😔😔😔😔msyado lang ako napaparanoid