Cough of new born

Hi mommies, i have new born and 3 weeks old palang sya. Nung nag 2 weeks sya. Meron syang sipon? Halak ganon. Minsan wala. Minsan din kase hindi sya nakakatulog i think about the phlegm? And inuubo din sya while dumedede, it is normal? Then minsan kapag tulog sya. Nag ccough sya 2-3 cough i think, it is normal?? Or need ko na i pa check? Thankyouu