if im 5' 4'' and expecting a big growth spurt what size should i get

Tech Specs:

Material:

[Shell] Storm-lite 3.0-C; [Lining] mesh, with fleece lined butt and knees 

Insulation:

None 

Waterproof Rating:

10K 

Breathable Rating:

10000g 

Side Zips:

Ghetto slits 

Venting:

Inseam vents 

Pockets:

2 Front, 2 back, 2 cargo 

Seam Taped:

Yes, fully 

Waist:

Belt loops with belt, internal adjustment system 

Recommended Use:

Snowboarding in all conditions 

Manufacturer Warranty:

1 Year