Thank you for the replies!!!
It is very reassuring to hear others with the same experience...
I was a bit worried cause I don't want to clog him up

briggsy's girl - I do offer him a sippy cup filled with water with his every meal and he bites on the spout (it is one of those non spill spout). Not sure whether he gets much in...

sloane - yes, he is BF bubba and he has milk whenever he wants so I do hope that that helps with his regular... Maybe the weet bix does that to him too, I know that his poo gets really fibery when he has weet bix.

Problem is now he hasn't pooed for 5 days.... DH gave him some banana 3 days ago and I've read that it can constipate some babies... I hope he is not one of them but the sign is not good. He has been irritable the past couple of days and been lifting his legs and bum up and making this pushing noise. Most of the times he will pass wind but still nothing coming out. Haven't been giving him any solids since...