These are some of the children's birth/christenings showing on IGI:
1. AGNES BAXTER Christening: 12 JAN 1851 Bothwell, Lanark, Scotland
2. EUPHEMIA BAXTER Christening: 13 MAR 1853 Bothwell, Lanark, Scotland
3. ISABELLA BAXTER Birth: 22 SEP 1855 Bothwell, Lanark, Scotland
4. WALTER BAXTER Birth: 06 MAY 1858 Bothwell, Lanark, Scotland
5. PETER BAXTER Birth: 01 JAN 1861 Bothwell, Lanark, Scotland
You're in luck

- an 1855 birth for Isabella (No.3 above). The first year of official registration in Scotland resulted in a wealth of information being included on the BMDs that year. For that year only the entries ran over two pages of the register and for births, will include age of parents, where they were born, how many children they'd had (alive/deceased) etc.
Image available to view on Scotlands People.
Regards.
Monica