Datalist UpdateCommand not working

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ASP.NET

Hey Guys,
following is the code for EditTemplete-UpdateCommand of a dataList Control(Datalist1), I am using Linq2Sql. The Sql Class name is Baby and I am using the datalist control to diplay the all the records from Baby table.
The problem is, that for updating how do I get the Itemindex of the record that is to be updated. I know the problem is only with one line in the following code that is "Baby bab = (Baby)e.Item.DataItem;" but I really don't know how to get it right

protected void DataList1_UpdateCommand(object source, DataListCommandEventArgs e)
{
    TextBox txtName = (TextBox)e.Item.FindControl("txtName");
    TextBox txtDate = (TextBox)e.Item.FindControl("txtDate");
    TextBox txtTime = (TextBox)e.Item.FindControl("txtTime");
    TextBox txtParents = (TextBox)e.Item.FindControl("txtParents");
    TextBox txtWeight = (TextBox)e.Item.FindControl("txtWeight");
    TextBox txtLength = (TextBox)e.Item.FindControl("txtLength");

    Baby bab = (Baby)e.Item.DataItem;  ////Code with the problem
    bab.name = txtName.Text;
    bab.date = txtDate.Text;
    bab.time = txtTime.Text;
    bab.parents = txtParents.Text;
    bab.weight = txtWeight.Text;
    bab.length = txtLength.Text;
    bab.Save();
    DataList1.EditItemIndex = -1;
    DataBind();

Thank you for all the help.
Chetan.