While I've heard the same, I actually showed later, moved into maternity clothes later, and felt movement later. While I lost all of my baby weight from dd before getting pregnant with ds, I think my new body shape just helped hide my developing bump better. Feeling movement later was a result of having an anterior placenta with ds.
While I know my experience isn't the norm, I wanted to share it in case the same happens to you.
Mommy to N (3), J (2), and C (10 months). LO4 is due in mid-September.
Re: When