2nd Child Suddenly Older than 1st Child

[eskuppe]

Well, as the title suggests ^^, i had 2 kids (well not me, the girl in the Sims3 ^^) and they were roughly 3 - 4 days apart from each other when I/she had them. When the 1st kid became a "child" the 2nd kid was only 1 day away from becoming a "child". Now, they are both "children" but the 2nd child is older than the 1st one...
Has any1 had any similar problem, or does anyone know how I can change the ages back (coz i really want the actual firstborn to be older )?