When considering the use of Regaliz Folirich Hair Growth Serum during lactation, it is important to understand the safety profile of the product's ingredients and their potential effects on both mother and baby. Generally, topical hair serums have minimal systemic absorption, which means the risk of affecting the breastfed infant is low. However, since the baby is exclusively breastfed and very young, caution is advised.

Key points to consider:

• Check the ingredients: Ensure none are known to be harmful or contraindicated during breastfeeding.
• Avoid application near the breast area: To prevent accidental ingestion by the infant.
• Consult a healthcare provider: Before starting any new topical treatment during lactation.

If the product's ingredients are safe and used as directed, it is usually acceptable to use such serums. Still, professional advice tailored to your specific situation is best to ensure safety for both you and your baby. Consulting a dermatologist or a lactation specialist would be advisable.