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is a condition mainly caused by the difference in relative humidity in winter;washing or bathing with harsh soap;deficiency of vitamins
A;D;sunburn;systemic illness;and choline inhibitors and even few medicines.The common treatment for dry skin is with emollients; and moisturizers.Now a days there is a big promotion of collagen
creams and supplements but as the collagen is a complex molecule the absorption through skin is not possible and even the assimilation after oral supplement is doubtful.Please use moisturizers and emollients and that should help as you are breast feeding you should not take any collagen supplements orally.
I hope i have answered your query.