Ooh good na you're following your pedia's advice! Lugaw can stay in the ref for up to 3 days in an airtight container, but honestly a lot of us mums prefer to store it in ice cube trays or small portions kasi mas convenient lang for one meal a day and mas fresh pa, you can just pop one out, thaw, and serve! Since 5 months pa lang si baby, make sure it's cooled completely before storing, and always check if it smells off before feeding (though rarely naman an issue). You're doing great with introducing solid foods the right way!