Oo, totally normal yan sa 1 month old, lalo na pag lumalaki na sila! A few of us moms noticed na around that age, ang babies natin ay parang mas aware na sa kanilang kamay at gusto nilang explore, kaya laging nasa bibig, it's actually a good sign na developing sila properly. Hindi ka mag-aalala, eventually mapapansin mo lang na mas maraming interesting things ang makikita nila around 2-3 months pa, so less hand-sucking na. For now, just keep those tiny hands clean, at kung nakikita mo siyang comfortable at happy, you're doing great!