Is it true that when your child has recurring cough and colds he/she has "pilay"?

No. Seems like your baby has an infection. Have him or her checked by your pediatrician asap. PS: If totoong may pilay po ang bata (or kahit matanda), huwag na huwag pong ipagagalaw or ipapamasahe basta basta. magpacheck po muna sa doctor kasi kng may pilay po tlga yan, baka lalo pa syang mapilayan pag ginalaw ung body part na yun.