put it before feeding. he will be comfortable to suck and drink milk

when should I give nasoclear to him before milk or after milk?

u can put saline drops or nasoclear 2 drops in each nostrils. plus u can do home remedy of ajvayan ka sek(roast some ajvayan on tava and make a potli of it by tying it in some thin cloth like handkerchief) and give its sek to baby