Hi thumb sucking is behavioral and will improve with time gradually don't worry

Unfortunately for parents, this is a normal growth phase in children, and two years of age is endearingly referred to as "Terrible Twos," for this reason. It is great to know that you have patience and for the other times you should cut yourself some slack. Ask your husband or other members in your family to help you out. - When your son misbehaves, explain to him how his actions are wrong. Reduce his play or TV activities so that he knows there are consequences for not listening to instructions given to him.
- If he starts throwing objects or yelling, take him away from there and to another room and explain to him what he is doing wrong. In public places do the same thing, by taking him away from the crowd. If you shout at him it will only make him want to continue acting in a negative way.
- Do not conduct arguments or disputes in front of your son as children are easily influenced by what adults do. In a similar fashion, reduce the TV time of members in the house and spend more time doing activities with your child.
It is often tempting to take the easy way out because as parents you have a lot to do in raising up your child. But it is for the benefit of their future development you take time out foster their growth

Thumb sucking usually devolps when they are not been provided with enough of food (i.e milk )or enough of attention by parents or care givers , these are the two main reasons , some times for soothing themselves also they will adopt it , so make sure you give good amount of milk in regular intervals as some babies after devolping habit they won't even cry when they are hungry, and make sure you give your time to play or be with the baby so that he can feel secured .

What you are relaying is a concern of several parents who are in your position. Most children at this age are stubborn and have short attention spans. They need to change every few hours or minutes. Try to make a schedule for her. Also, try to give small 20 minute intervals for her to participate in activities. Following this, she can do something she likes. You have to teach her how to concentrate. Another thing is to teach discipline. When your daughter throws tantrums tell her that there will be consequences. Take away some TV time or playtime so that she knows that when she does misbehave there will some consequence as a result. It will take time and there will be bumps in the road. But do not lose heart. Keep trying. Also find ways that work for you.

Give her some color ful books ,while eating, make some nice story and tell her, according to picture of books.
And cut off the power of TV , if she tells toh switch on the TV ,tell her there is no Power, for some days she will throw tantrum but you have to very firm , on your words.

Hello dear. Apne ya kisi ne use pehle school k bare mein baat ki? School jaoge? Aisa puchha? Ho sakta h ki jab wo khana nhi khata hoga ya badmashi krta hoga ya kuchh aur tang karta hoga toh apne ya kisi ne daraya hoga ki aise karo ya ye karo nahi toh school bhej denge. Aisa kuchh hua h kya?

Since she was 4 weeks early you can expect her to hold her head up properly in another month I guess. Did you consult a paediatrician?

Probably at 8 weeks babies heart beat can hear through early ultra sound... sometimes at 12 weeks too,so it depends on individual,your Gynaecologist will tell you everything...
Don't worry,
Consult with your Gynaecologist and clear all your doubts...

Has anyone behaved like this in front of your girl?
Talk to her normally about it and be strict and say no whenever she repeats it in front of you, take help from people around her at home and school so that she learns it is wrong and talk to her understand why she does it. If she isn't understanding then you can also consult a child psychologist, they can help.

Bullying is not good behavior and can really hamper your child's emotional sense

I wont call it as disorder...I m not sure who calls this as disorder....hyperactive is a positive term...just need to curb it down may be talking to the baby...understanding babies needs etc. Try to guage where ur child's interest are..try to let him spend as much time in it...don't worry this shall pass soon.