I wore my ergo with my 2 year old son in it on my back and or hip while I was pg with dd I was fairly small with her until the last month or so I fastened the belt below my belly and since the straps just go over shoulders and arms not around you it fit even though I became rather shall we say large chested. I was as comfortable as a 7-8 month pg lady with a toddler could hope to be I suppose. Ergo sells a strap to extend the waist belt as well. I never needed it as my hips didnt get much bigger so I could keep it low. Good luck.