If your child needs medical help from a specialist, your pediatrician may give you a referral to a specialist and also name you a specialist.
You can also look for a specialist yourself. Specialists in your area can be found in the local phonebook or Yellow Pages or the Internet on the website of the German Medical Association under the menu item Service / physician search, http://www.bundesaerztekammer.de/service/arztsuche/ or on the website of the National Association of Statutory Health Insurance Physicians of the federal state in which you live www.kbv.de, Menu item "Service / doctor search".
If you speak only a little German and therefore look for a doctor who speaks your language, the Association of Statutory Health Insurance Physicians of the state in which you live, can help. The addresses and telephone numbers of the Association of Statutory Health Insurance Physicians in the federal state in which you live can be found on the website: www.kbv.de/html/432.php.
You can find a medical specialist in Hamburg via the Internet, for example at the local medical association: https://www.aerztekammer-hamburg.org/arztsuche.html
There are local services to make an appointment with medical specialists, for example: http://www.kvhh.net/kvhh/pages/index/p/1013. Please make sure to have a medical transfer by your family physician.