bumblebee I am so sorry to hear your news, I am sure you will be a great comfort to your mum as will your DD. sunbeam good luck today.
Re blankets with DC1 (also a summer baby) we underestimated!
We got
~ 1 thin cotton blanket which folded in 4 (pumpkin patch),
~ 1 double thickness stripy cotton blanket (toby tiger),
~ 1 large knitted blanket which folded in 4 (John Lewis) and
~ 1 medium (folded around her) which was handmade. That was ok.
These are DD's blankets though - can't possibly use them on this baby so will have to get hunting for some more
I am also going to struggle to reuse any of the really little baby clothes so thinking I will put those in a memory box for DD and buy some new ones for this baby.
We had 2 furry sheets for the moses basket and 2 cotton sheets - these also worked in the pram carrycot. We have 4 sheets for the cot (all furry). If you lay a folded muslin over the sheet and tuck it in (firmly) both sides under the babies top half then if baby possets you don't have to change the sheet.
We ended up with about 4 growbags, 2 from IKEA and 2 extra Boots ones but DD truly hated them, also bought a scary expensive muslin grobag which Dd also hated but was v pretty.
Then when her 2nd winter came (15/16 months) we got padded fleece babygros which saved our sanity for a while - Mothercare. Awesome. But then a light blanket over it in the depths of winter.
Re babygros. Every store has slightly different sizing. We got
7 vests in 0-3month (Tesco)
7 vests in Newborn (Boots)
3 babygros in 0-3 Month (Boots)
3 babygros in Newborn (Next)
Top tips
I realised when I put them all together after my first buying sprees that some shops newborn & 0-3 were the same bloody size cue panic.
What we did find brilliant was some little knitted cardigans which an adoring great aunt knitted - think we had three, baby wore a vest, babygro all day/night if needed with cardi and blankets as needed. layering is v important when they are tiny.
And Eden & Anais muslins - I bought these DD's second summer after she turned 1, they aren't cheap, I got a pack of three with an Indian pattern but blissfully wonderful as sun shades, cot sheets, pram covers and very unique this baby will obviously have to have its own set
Get plenty of muslins in different sizes - I got 6 12x12, 12 18x18 and then the big E&A ones. DD liked to chew them.
Hope thats helpful - beats doing any work!