Hi mama, hindi ko masyadong common yan na 40 seconds breathing pattern sa 7-month-old, kaya I'd really suggest bringing this up with your pedia sa next checkup para sure lang na lahat okay, sometimes babies do weird breathing things pero better safe than sorry, diba? When mine was that age, she had her own feeding quirks too, pero pag may concern sa breathing talaga, mas okay na i-check ng doctor agad para peace of mind mo.