Horizontal Stripes

Do horizontal stripes really make a person appear wider?  Because I've started using horizontal stripes on James in an attempt to make him look a little more rolly-poley.  He's not too skinny yet, but he's just so long and narrow.  He is just over one month, over 22 inches long and just under 11 lbs, which is completely normal for a one month old.  However, most of the clothing brands make these really short and wide outfits, and the only brand that is fitting him really well is Precious Firsts by Carters (the brown and white stripe is one), otherwise he's wearing 6 month+ outfits to get the length and then swimming in them because the outfit is too wide.  Here are some pictures using the horizontal stripes!