The following applies to travelling with children
The rules concerning what is required for children travelling without a parent/guardian, or with only one parent/guardian, may vary from country to country. The following applies when entering or leaving Sweden.
When travelling to and from countries outside the Schengen area, it is a requirement that all travellers, including children, must present a valid travel document. Also when leaving Sweden will a control of valid travel documents be performed, even for Swedish citizens leaving Sweden.
The Police recommend that even when travelling within the Schengen area all travellers should carry their personal travel document, a passport or European identity card or other national ID card, with them.
The Schengen area
26 countries are included in the Schengen area. All EU countries except Ireland, Bulgaria, Croatia, Cyprus and Romania are part of the Schengen agreement. Even Iceland, Norway, Switzerland and Liechtenstein are part of the Schengen area even if they are not EU members.
Free movement is the general rule within the Schengen area, which gives EU citizens the right to travel, work and reside in other EU countries.
There are, however exemptions. Like in the situation where a minor who is a citizen of another Nordic country enters Sweden with their parent/legal guardian, the minor should be permitted to enter as long as the parent/legal guardian can provide proof of identity and right of entry by presenting acceptable official documentation, and document that they have parental rights or legal custody/temporary guardianship of the minor. This can be done by e.g. presenting a birth certificate or other official document, and/or in relevant cases the written consent of the parent/guardian not accompanying them.
It is part of the work and responsibility of the Police to protect children by hindering and preventing criminal activities, such as human trafficking or the abduction of a child by a non-custodial parent or by others. What this means that in practice is that in connection with border controls additional questions may be asked or other measures be taken, such as searches of computer databases, for the purpose of ensuring that everything is in order, both when children are travelling unaccompanied or even when in the company of adults.
The rules concerning what is required for children travelling without a parent/guardian, or with only one parent/guardian, may vary from country to country. The Police advise travellers to contact the relevant public authorities to check what is applicable and in effect in the country in question.