I just limited my four month old daughters pacifier time. Now she has started using her thumb. What should I do ?

she is still so young. she needs to self-sooth!! think in ur baby's shoes, what can she do when she feels stressed or upset or just need to suckle? we can't expect them to handle it like adults. imagine someone limiting your ability to calm yourself down when u feel anxious. it is their instinct to suckle. unless mummy can comfort nurse her more frequently? just thinking, would rotating the use of pacifier and thumb and comfort nursing help? what about providing other alternatives such as comfort cloth or blanket or bolster ('chou chou' in mandarin) so that they can self-sooth?