Bring home Nestle Lactogen 4 No. to give a complete nutrition that is essential for your growing babies. After 18 upto 24 months. NESTLE - Lactogen No. 4 Refill is a spray dried follow-up formula that contains a combination of nutrients that support growth and development. At 18 months toddlers have high energy requirements, thus this is the perfect product to help your little ones grow bigger naturally.