In terms of Baltic/North Sea travel to UK in 1860s and 1870s (probably from Libau or Konigsberg), a number of my ancestors arrived as infants or babes in arms with their parents, including a daughter (b c 1865) who was the eldest surviving child of at least 12 children, with the rest being born in Hull from 1870 onwards.

But there were also examples of unaccompanied children travelling. In 1870 my great grandparents (who were first cousins, and married in Edinburgh in 1877) arrived in Edinburgh aged 11 and 15, together with the two brothers of my great grandfather aged 8 and 6 respectively.  They were joining my great grandfather's sister and her husband and infant daughter who had arrived in 1868 from Warsaw (where they married in 1867 and had their daughter in 1868). They all came from Vishtinetz, then in Poland, now Vistytis in Lithuania. My great grandparents came direct on the sea route, not via Warsaw, but apparently there was a community of people in Warsaw who came from Vishtinetz, in the aftermath of the 1863 Polish uprising and the Baltic famine of the late 1860s and early 1870s.

Jill Whitehead, Surrey, UK