Walker'sYouth Children’s Low Profile Padded Headband Adjustable Folding Noise-Reducing Hearing Protection Earmuffs

How do you adjust the headband?

Will this fit a 2 month old? I would like to bring my baby to church

Will these work for a concert? Very loud concert so will these work???????

Are these electronic earmuffs? Meaning, if someone who is next to you speaks, that sound is amplified into the earmuff? Loudness kept out?