Hi Mam. Breast feeding is the best for overall health of the baby. Formula feeding is much inferior. Breast feeding has numerous advantages including protection from infection, allergies and cancer. It also improves body growth and brain growth, IQ of babies. So continue your efforts to give breast feeding your baby... For office going mothers, breast milk can be expressed and kept in a clean container at room temperature for 6 - 8 hours...then give it with a spoon to the baby without heating ... So breast milk can still be given to baby... Also after 4 months first foods can be started if mom is not able to give breast milk for any reason... Usually start with rice porridge, cerelac, boiled potatoes etc.. But must be made cleanly and given.. If baby needs some milk, then go for Nan excella pro 1 instead of lactogen as it is close to mother's milk ...