Ideally,only breastfeeds should be given till 6 months of life. Medicines may increase lactation,you can try Tab perinorm twice a day and cap lactare 2 cap thrice a day,both for 15 days. If effective,continue for atleast 3 months,if not,stop. If forced to give top milk feeds,give ONLY formula,any brand will do,all are more or less the same. Maintain strict hygiene.