Why do my 11 months old baby keep waking up at night despite having only a short nap at noon?

Hi mummies, why do my 11 months old baby keeps waking up at night even after bottle feed he will still wake up and my room temperature is totally fine as well, after putting oil and some back rub he will still wake up. What should i do? #1stimemom #pleasehelp #advicepls #firstbaby #bedtime