Consult with Pediatrician physically for further evaluation and treatment

I think both needs to be changed once a month. At a time 2 bottle in use.

Breastmilk + Bottle Combo: breastfeeding and bottle-feeding, keep a close eye on nipple condition—breastfed babies often prefer slower flows (like a Level 1 nipple), which can wear differently than faster ones. • Stock Up: Have 3-4 bottles and nipples on hand so you’re not rushing to clean one mid-day. Rotate them to spread out wear. • Daily Use: If you’re using one bottle 2-3 times a day, washing and sterilizing it each time, it could last 4-6 months. Nipples, though, might need swapping every 6-8 weeks with frequent use.