Thanks for query
First of all I want to know how did you assess that your wife does not have sufficient. Does not your baby satisfied after feed or sleep for 1-2 hour, does not she passes urine 5-6 times per day ? Best way to assess adequate feed is that weigh your baby on electronic machine before and after feed and check whether there is increase in weight or not. If at all there is decreased milk production then encourage the mother emotionally, make her stress
free, give her plenty of water and at least 40% extra nutrition. If you have tried all this then you can use formula milk any one lactogen or nan but follow the instruction mentioned on the container like proper dilution or hyigene maintainance.
I hope this answers your query effectively.