my baby is 18 month old, he doesn't want to have food at all, what's the reason and solution

A. Hello mom reasons could vary out of these, could be tummy issue, observe his motion and urine outout , other is the weather, as it gets warm the appetite tend to get low, other is teething phase, also the taste of food or same foods every day also tend to get them bored, so add flavours , variety , give them family foods now,