Baby throwing up curdled milk frequently

Greetings Vomiting curdled milk in a 3.5-month-old infant is often a normal sign that milk has mixed with stomach acid during digestion, but when combined with a cough, cold, and nasal congestion, it may be caused by swallowing excess mucus, a viral respiratory infection, or gastroesophageal reflux. Additionally, putting hands in the mouth is a common developmental milestone called mouthing, used for sensory exploration or self-soothing, but in this context, it could also suggest discomfort from teething or a mild fever. Potential causes for these symptoms include a common cold, a lingering gastrointestinal infection, or a milk protein allergy. You should monitor for signs of dehydration, high fever, or difficulty breathing and consult a pediatrician to confirm the cause and discuss treatments

Looks like reflux with cold. Milk curd vomiting is common. Give small frequent feeds, burp well, keep baby upright after feeds. Use nasal drops for cold. No major concern unless vomiting becomes forceful or baby is dull.

Consult with Pediatrician physically for further evaluation and treatment