2.6 tog sleep sack

hi! My son is 7.5 months and we’ve been using the 2.6 TOG gunamuna sleep sack with the Nanit breathing bands sized 12-24 months for months now! Since he’s been 6 weeks old (starting with the smaller breathing band and then moving uo to the 12-24 month. We’ve never had an issue with it reading breathing etc. he’s been rolling