I find the Ergo really uncomfortable for bub until they reach about 5-6 months depending on their size. Arlia is 20 weeks now and I have started using the Ergo instead of the hugabub as she's an ok size for it now. I still find that her little bottom doesn't fully "sit" in the Ergo (there's still pocket of fabric where her bottom will be when she's bigger), but I like the convenience of being able to loosen the Ergo and breastfeed her in there (something I never mastered with the hugabub). My kids were never comfortable with the insert so we used the hugabub which I loved. It has such great head support, especially when they are sleeping and you cover one side of their head securely to your chest

Once they are the right size though I adore the Ergo. I even use it as a back carry for my 19 month old