I used to sort of 'side-mirror' a statement made in the wrong tone. "Get away from me!" "Okay, try that again, like this: 'Please give me some space." Kids do really well with scripts for situations, and don't mind (usually) repeating the correction as long as there's no hint of punishment or disapproval. Much like when you coach them to put the right shoe on the right foot, not the left.

It will take time for kids, gradually they will stop crying ...

What kind of stress... You haven't mentioned properly.. Is it related to your son.. Or something else.

Then so what dear? He can call you mama... at the end you r his mother

Little ones usually suck their thumb as a means of comfort. Often times it is frustrating for parents but it is important to remember that this is just a phase and with time it will pass. - You can try to ask your daughter if she would like something else that would provide her with comfort. This could include a new soft toy or blanket. - You can tell your daughter that such kind of behaviour should not be practised in front of people and it is ideal she restricts it to the confines of your house. - You should praise your daughter when she does not suck her thumb. If she notices that only negative behaviour gets noticed then she will continue to do it. - You should try to keep your child's hands busy with activities like playing or puzzles which can be constructive so that her thumbs will be preoccupied at all times. This behaviour is common amongst children at this age.

it's ok he is young
Try out different activities where you can make him learn
Are there any other activities too where he tends to be a little slow?

Hi it's due to colic pain, hold baby vertically after every feed and position properly to the breast so as to avoid air ingestion while feeding which is the most imp cause of colic pain and gases and fuzziness

Anything in excess is always bad needless to say. As moms v r worried regarding our baby's activities. 20 min at a time will not create a big issue. He can watch.
Sometimes v also need some rest and 4 that time u can allow him to watch.
Provide him building blogs. Introduce alphabets . Even u can bring a bluetooth speaker and start plarying rhymes on it. He will listen and njoy.

Deal with her with love.. try avoiding all her demands which r not necessary.. make her realise that she is not demanding in a proper manner..

Prepare him mentally for your second baby. He is very small, so needs your love more. He may feel that he looses his mother's love and care gradually ,which may make him to behave stubbornly. Take more care of him a lot.