Has anyone of you used the pseat carrier for babies? Are there any different from normal baby carriers (ergo carrier)?

If that is a hipseat carrier, I advise you not to get it as it is not an ergonomic carrier and does not support your baby's spinal and hip development. Babies have a C shaped spine and an ergonomic carrier should be able to support this shape. Ringslings, Mei Tais, Woven Wraps, Wide base soft structured carriers are ergonomic carriers. Baby should be worn in a deep seat and his legs should form an M shape. Do read up more on babywearing before purchasing a carrier.