It is normal noises... Like respiratory sounds can be heard or it may be like he his forcing something... These are normal
Look for sleep duration (atleast 1.5 hours after each feed), weight gain ( see in growth chart) and urine output (>7 times in 24 hours)
If these things are normal than he is absolutely normal
Next Steps
give exclusive breastfeeding till 6 months of age
regular vaccination according to schedual