Hindi ko talaga sure kung pwede, mamsh, pero usually ang formulas para sa older kids ay mas concentrated at may different nutrients kaya mas safe na sundin ang age recommendation, baka masyadong heavy pa sa tummy ng 2-year-old. Better to ask your pedia about it since bawat bata naman ay different, or stick sa formula na specifically for 1-3 years muna para peace of mind lang! Ano ba ang dahilan mo na gusto mong i-try ang GainSchool, nag-aalala ka ba sa growth niya or may concerns lang?
Hindi ako sure kung pwede talaga, but from what I know, yung GainSchool is designed for 3 years and up kaya may specific nutrients para sa older toddlers. One of my mum friends tried giving the 3+ formula to her 2-year-old and the pedia said it's better to stick with the 1-3 age group para sa nutrition na akma sa age niya. Best to double-check with your pediatrician muna kasi baka may differences sa iron content or other nutrients na importante pa for 2-year-olds!