Aww... My son did dat too like twice or thrice wen he was dat age. He pooed after 8days on his own,though i was almost in tears cos of his cries and straining all day. I took oranges and massaged his stomach gently. I also fed him some of d orange juice... Natural orange(few drops of it).

No cause for alarm,it is normal with new babies. My baby did dt too bt stooled at her own time

Gently massage his tummy with warm water during his bath. Eat veggies and fruits with enuf water.