As babies reach their first birthday and become toddlers, acid reflux typically becomes increasingly less frequent for a small percentage of toddlers, however, acid reflux persists and may cause troublesome symptoms, which can range in severity from an occasional "tummy ache" to an ongoing refusal to eat and failure to grow normally. Acid reflux in 5 year old at night. Go to main prep instructions; pay acid reflux in 5 year old at night symptoms (