I’m having a bit of trouble thinking of baby girl names that go well with big sister [name_u]Saige[/name_u]. Any suggestions would be great. Thanks so much! 
Did you choose [name_u]Saige[/name_u] because of it’s nature theme? If so, and you would like to continue in that theme, what about:
[name_f]Saffron[/name_f]
[name_f]Willow[/name_f]
[name_u]River[/name_u]
[name_f]Calla[/name_f]
[name_f]Rose[/name_f]
[name_f]Linnea[/name_f]
Other suggestions:
[name_f]Aria[/name_f]
[name_f]Keira[/name_f]
Some ideas:
[name_f]Oliana[/name_f]
[name_f]Tallulah[/name_f]
[name_f]Pansy[/name_f]
[name_f]Molly[/name_f]
[name_f]Fawn[/name_f]
[name_f]Bryony[/name_f]
[name_u]Rowen[/name_u]
[name_f]Hallie[/name_f]
[name_f]Posey[/name_f]
[name_f]Maple[/name_f]
[name_f]Cleo[/name_f]
[name_u]Winter[/name_u]
[name_f]Sinead[/name_f]
[name_f]Tansy[/name_f]
[name_f]Maize[/name_f]
[name_f]Unity[/name_f]
[name_f]Tessa[/name_f]
[name_f]Neve[/name_f]
[name_f]Crimson[/name_f]
Some names I think would be good are
[name_f]Mabel[/name_f]
[name_f]Maia[/name_f]
[name_f]Dora[/name_f]
[name_u]Eden[/name_u]
[name_f]Carly[/name_f]
[name_u]Casey[/name_u]
[name_f]Vera[/name_f]
[name_u]Skyler[/name_u]
[name_u]Rae[/name_u]
[name_u]Regan[/name_u]
[name_f]Sophia[/name_f]
[name_f]Lily[/name_f]
[name_f]Scarlett[/name_f]
[name_f]Sabrina[/name_f]
[name_f]Violet[/name_f]