Sitting up without support & learning to stand

Time flies... Samuel is 7 months old now. He is getting naughtier everyday. We bring him to Sunday service every week ever since he was 3 months old. He used to sleep through out the whole service, but now... he will play with anyone who is sitting behind or in front of us, talking to them in his own language, smiling to them.

Samuel now can sit without support. Before this he would sort of swing from side to side when he was sitting up. I saw him sat up on him own the other day, and leant forward to get the phone in front of him. He then smile at me when he got the phone in his hand, like he wanted to tell me,"Yeah, Mummy! See... I can get the phone myself!"... haha... my little baby is so cute!

Last Friday, as Samuel was sleeping in the play pen, I went downstairs to do the laundry. But I heard him screaming after about 15 minutes. I rushed up and this is what I saw...
I don't know how he did it. There was nothing around the playpen that he could hold on and pull himself up. Anyway, I was so happy to see that and I quickly grabbed my handphone to snap a few pictures of him standing. He didn't manage to hold for long, and sat down after about 20sec. haha... I believe he was as excited as I was that time and called me to come up to see him standing. :)