I love the gro bags, have used one for Charlie since about 20wks. Before that I just swaddled & put a nice warm blanket on top. Think until they move about its easier to swaddle than spend the dosh on the gro bag. I tried some other brands too as they are exp & tbh the other brands is where I wasted my $$$. Many don't have the piece that stops the zip scratching under the chin, or piece to hide the zip for when they know how to open themselves. Also the sizing on many isn't that great or the zip goes up, not down which is easier for night nappy changes....& I dont like polar fleece as it doesn't breath very well at all.

In Summer we had Charlie in a 1.0tog with a thin bonds suit so his arms were covered as it was very hot & we still had the air cond on. But I didn't worry about blankets. However atm I still have him in a 1.0tog as haven't got to buying another & he's in a wondersuit, singlet, socks & still put a blanket on him. When I get a warmer one then I don't have to stress about the blanket as much as we will also have the heater on to take the chill off. Depending on how cold & what you use its still nice to have the comfort of a blanket on top I think, but with Charlie it's always off in a matter of minutes LOL.

Yes I would suggest bambini pront also & they often have some on special.