Problem of forgetting appointments
Question

                I am a young mother of two young children.  

I have found that since i have had my children my memory has gotten very bad. Subhanallah I forget so much.  

So many people ask things of me and i say yes to them and have full intention of doing it for them however i simply forget. I know that this is a problem also for most of the sisters these days also. 

I was told by my maternal nurse that it is normal when women start having children. can it also be because of sins? Will i be in sin for not keeping my word?
Praise be to Allah.
    Perhaps your forgetfulness – or your weak memory – is a 
    result of giving birth, as your doctor said. This is not something to worry 
    about. Or this forgetfulness may be caused by sin, because sins result in 
    punishments that affect the heart and the body. Imaam Ibn al-Qayyim (may 
    Allaah have mercy on him) mentioned more than sixty punishments for sin in 
    his book al-Daa’ wa’l-Dawa’. 
So if a person feels that 
    he is losing some blessing, he should hasten to repent to Allaah. Allaah 
    says (interpretation of the meaning): 

    “That is so because Allaah will never change a grace which 
    He has bestowed on a people until they change what is in their ownselves”

    [al-Anfaal 8:53]

    If a person makes a promise then forgets it unintentionally, 
    there is no sin on him, because Allaah has forgiven this ummah for what they 
    forget, as is indicated by the texts. For example, the last two verses of 
    Soorat al-Baqarah (interpretation of the meaning): 

    “Our Lord! Punish us not if we forget or fall into error”

    [al-Baqarah 2:286]

    And Allaah has said: “I have done that.” (Narrated by 
    Muslim) 

    There are also means that will help you to remember 
    appointments, such as using a diary (in book or electronic form) to record 
    appointments by day and date. This is a means which is proven to work. How 
    many people forget their appointments, but they organize them by using these 
    reminders. 

    Another means is using an electronic alarm clock or a mobile 
    phone to remind you of the time of an appointment… and other modern means 
    that are available. 

    There are also audio reminders on which you can record 
    appointments and it will speak to remind you of the appointment. 

    Each person must pay as much attention as possible to this 
    matter, because breaking promises is one of the signs of the hypocrites, as 
    it says in the hadeeth: “There are four characteristics, whoever has them is 
    a pure hypocrite, and whoever has one of them has one of the attributes of 
    hypocrisy until he gives it up: when he speaks, he lies; when he makes a 
    pledge he betrays it; when he makes a promise he breaks it; and when he 
    disputes he resorts to obscene speech.”

     (Narrated by Muslim, 53)

     Keeping appointments is one of the signs of the people of 
    faith.

     Similarly those who miss appointments for a reason such as that mentioned in the question should explain their reasons to the other party involved, so that he will not be offended. We ask Allaah to protect us and you from all kinds of evil. And Allaah is the Source of strength.