No, you can fast them in separate days as long as they are in Shawal

And Allah knows best

The 6 days of Sawal must be fasting in order or not?

Fasting | March 30, 2014 6:37 pm
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Can we make 2 intentions in the same time for fasting the missed days of Ramadan and to fast also the 6 days of Sawal?
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A SISTER SHE HAVE TO MISSED UP 6 DAYS FROM RAMADAN (becouse of her menses) AND SHE WANTS TO KNOW IF ITS PERMISIBLE TO MAKE ALSO TARAWEH PRAYS WICH SHE LOST IN THIS DAYS ( SHE IS NOT PRAYNG CONSTANTLY IN THE NIGHT ,in the normal months) SHE ONLY WANTS TO KNOW IF SHE WILL RECEVE THE REWORDS LIKE SHE WAS MAKING TARAWEH IN RAMADAN