I have two ds one aged 6 and one aged 3. Dd3 due in a month. Ds2 still is in a pushchair but likes to walk. My problem is I have a bad back and can't see myself managing with a double buggy. At the same time bit worried ds2 not ready to be buggy free! Advice please? Need to buy something for baby as gave away last pram and time is ticking. Is there such a thing as a very lightweight double buggy? At moment I am trying to secure a second hand giggle2 as only 6 kg!