Aww, poor baby! Since nagpa-checkup na siya, did the doctor say kung sa sabon or lotion talaga? A few of us tried switching to fragrance-free or hypoallergenic brands kasi ang skin ng toddlers talaga ay sensitive, sometimes kahit "gentle" pa, may reaction pa rin. Try mo rin i-check kung may new detergent kayo for laundry or kung nag-change ng fabric softener, kasi minsan doon nag-trigger ang rashes. If the doctor didn't narrow it down yet, definitely balik-follow up para ma-identify exactly kung alin ang culprit so you can avoid it properly!