It doesn't look like a PST at all.. It looks like a smaller version of the GST, and smaller than the PST too, with zipper. It looks soo cute.. I just saw one yesterday at Hong Kong Chanel Boutique while window shopping with my DH.
I think it looks cute with pink! Since pink is a baby color! But unfortunately, the only color available here in Hong Kong is BLACK... I haven't seen much colors here in HOng Kong.. Only Beige and BLACK.. :/ And yeah, the Baby GST retails for HKD 14300.