I totally understand your concern. Before suggesting treatment, I would like to ask a few questions to ensure the correct management can be provided. Contact me on Practo or WhatsApp chat. Contact number: 97012307 two nine Dr. G. Avinash MBBS, MD (Pediatrics) Fellowship in Neonatology

Looks like it is Secondary lactose intolerance so this can be be alright by 4 weeks usually

Greetings True lactose intolerance is highly uncommon in infants under 2 to 3 years old, and a baby's ongoing fussiness or gas after diarrhea usually points to a temporary, secondary lactase deficiency caused by an irritated intestinal lining. True congenital lactose intolerance is exceptionally rare, whereas a secondary deficiency resembles a brief gut imbalance that generally self-corrects and resolves within 4 to 8 weeks as the intestinal mucosa completely heals. Alternatively, the persistent digestive distress and fussiness might stem from a cow's milk protein allergy (CMPA) or a temporary sensitivity to the specific proteins found in her infant formula. Managing a temporary secondary deficiency typically involves feeding specialized, over-the-counter lactose-free infant formulas or hypoallergenic formulas under a doctor's care, alongside a clinical evaluation of her ongoing symptoms.

Secondary lactose intolerance is not s big problem. Normalcy will come back in 2-3 weeks time. Breast milk can be continued. Primary lactose intolerance is very rare. It is mostly not the case.

Many babies around 2 months of age have frequent stools, gas, and fussiness due to an immature digestive system, and this does not always mean true lactose intolerance. If your baby is gaining weight well and does not have blood in the stools, persistent vomiting, or other concerning symptoms, the problem is often temporary and tends to improve gradually over the next few months, especially by 3–4 months of age. Continue breastfeeding, follow your pediatrician’s feeding advice, and monitor weight gain. If symptoms are severe, persist despite treatment, or are associated with poor growth or blood in stools, a reassessment may be needed to rule out conditions such as cow’s milk protein allergy.