I used them with my son from when he was about 5/6 weeks old. He never had any issues about wriggling down in them - make sure you buy the right size. TKMaxx always have a good selection of sizes, colours and togs, and some of them are the GroBag brand for cheaper! Depending on how warm July gets (!) you may just need to put baby in a long sleeved vest (no legs on it) and in the sleeping bag. If you're unsure, put in a wee sleep suit but no vest. If baby is 3 months old by that time, you'll have a better idea yourself of how warm the bedroom etc is and what you need to dress him/her in. Can't recommend the sleeping bags enough - so much safer than the blankets - our wee one always wriggled about and would end up with blankets everywhere. We used sleepingbags until he was almost 2 years old.
I'm not getting them because my SIL told me when her friends baby had learnt to stand, he stood up in his sleeping bag on his cot and fell over and hit his head on the cot! He was okay but it's put both me and SIL off using them!!!
Thinking we will just use blankets. I have made some with tags on long enough to go down the sides of the mattress and then little tags to fasten round the cot bars. So he will have a real effort pulling them over himself
I've only got the one at the minute, gingerbread one from mamas and papas to match the nursery but I think it will be too warm for summer it's 2.5 tog? Tk maxx normally have loads of gro bags in for cheap!
We've got given a really cute one from Matalan, but it is 2.5 tog and says not to use until baby is at least 10Ib on the label so was thinking of buying a 0.5 tog one for the summer. Might look in TKMaxx actually, after everyone's comments.
Also, not sure if this is useful for anyone else, but these two links explain what blankets/sleeping bags to use for different room temps:
we used a sleeping bag with DD from about 3 months and would have used it sooner had she not been a swaddle baby and refuse to sleep at all if not swaddled. theres no real issue with wiggling down, as long as you get the right size the arm and neck holes will not be large enough to allow this to happen. i found they were particularly useful in the summer. i bought a lighter tog one and it meant during hotter nights i could put DD in her cot in a long sleeve vest and her sleeping bag and shed not get too hot or cold (with her blankets we were having to put her in much heavier clothing because shed kick off the blankets and wake up cold crying. people used to think i was crazy if they stopped when they saw me dressing her so heavily on a summer night! x
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